Tài liệu này là tuyển chon hơn 1500 bài tập về phương trình logarit bao gồm nhiều dạng khác nhau giúp bạn đọc có thể tự rèn luyện khả năng cũng như kĩ năng nhận dạng các loại bài tập logarit cũng như phương trìnhmũ và logarit.
Phương trình mũ Logarit PHƯƠNG TRÌNH MŨ VÀ LOGARIT x 1 .8 x x 1. 3. x 2x 5. x4 x 2 .3 7. 9. x 2. 5x 5x1 5x2 3x 3x1 3x2 500 x 2x1 2 .3 3 3x 3 2 x 4. 3x2 x x 2x x 6. 7.2x 2x 10. 23x 6.2x 20 2x 81cos 21. 4.3 9.2 x 8 cosx x2 3.(x 1) 12 1 2x x x 4. 16. 5.32x1 7.3x1 6.3x 9x1 x 1 18. 2log x2.log2 x 48 20. 125x 50x 23x1 x log2 x2 x 2x . 17. 4.23x 3.2x 22x2 24x2 19. 2.9 x 1 x 12. 4.33x 3x1 9x 14. 30 15. 5lgx 50 xlg5 x log2 x3 4 8. 8x 18x 2.27x 11. 53x 9.5x 27.(125x 5x ) 64 13. 81sin x cosx x 5.6 22. x12 2 x2 2x 1 2 23. 32x 2x .3x 9.2x 24. x2 2x .x 2. 2x 25. 9x 2. x .3x 2x 26. 3.25x2 3x 10 .5x2 x 27. 4x 3x2 4x 6x 5 42.x 3x7 1 28. 4x 33. x x 32 35. x xlog2 xlog2 Hoàng Ngọc Phú 21x 2 x 1 1 30. 12.3x 3.15x 5x1 20 29. 8.3x 3.2x 24 6x 31. 2x 3x 6x x 32. 3x 4x 5x x x 34. 32 22 2x 3x1 2x1 x 36. x xlog2 xlog2 Page Phương trình mũ Logarit 37. 39. x2 6x 38. 0,25.42x1 16 2 2 4 x 2 41. 3 x 1 3sin x 1 x2 1 2x 1 2x 1 40. 2.5 4 x 123 x 2 3x4 4 42. 7 43. 32 x x 30 45. x 16 92x2 cos2x 3cosx 1 44. x 46. x 2x 49 16 1 x 22 x x 47. 4x 6.2x1 32 48. 27x 13.9x 39.3x 27 49. cot x cot x 50. 9x 51. 2 2x 53. 3log3 x x 1 1 52. 1 x x 36.3x 3 30 36.32x 54. x x x xlog3 x 162 55. x x x 56. x 3x 5x 10x 57. 2x x 58. 3x 2x 59. x 2.(x 2)3x 2x 60. x x .2 x 12 4x 61. log2 x2 3logx x 102 logx 62. x 63. 8.3x + 3.2x = 24 + 6x 65. 2x x 4.2x 2 x 22x 71. 2 x 5 sin x 66. 4x x 4 52 70. sin x 75. lg x 2 x lg16 lg 4 Hoàng Ngọc Phú 3x2 4x 6x 5 42x 3x 7 68. 8x + 18x = 2.27x 73. 6.9x 13.6x 6.4x x 16x2 64. 12.3x + 3.15x – 5x + = 20 67. 3.8x 4.12x 18x 2.27x 69. log2 4x 1 2 x 1 72. x x 16 x x 3 74. 8.4x 70.10x 125.25x 76. lg lg3 lg x 27 2x Page Phương trình mũ Logarit 77. log2 4x x log2 2x3 log 2x 1 2x 79. 17x2.x2 81. log92 x log3 x.log3 78. log2 4x1 .log2 4x log 80. log4 log3 1 log2 1 3log3 x 2x 82. logx3 2x x 84. log 1 .log 5 85. log x 1 log x log x 86. log x x 1 log x x 1 log x x 1 log x x 1 83. Tìm x biết lg2,lg 2x ,lg 2x , theo thứ tự lập thành cấp số cộng. x 1 x 25 89. 87. log27 x2 5x log x3 5 .log x 3 log9 x 3 x log3 x2 x log3 x log3 x 91. log2 x log3 x 92. log6 93. log7 x log5 x 94. log2 log3 x log3 log2 x x x log4 x 95. log2 x x2 .log3 x x log6 x x 96. 97. 3log2 48 88. xlog x3log3 x 90. x l ogx l ogx log2 x2 4x 2. log2 x2 4x 98. log2 3x 1 100. log x2 log x3 x log x log2 x 1 99. log x x2 14.log16x x3 40.log 4x x x2 1 1 x 101. log6 3.4 2.9 x log6 x 102. Cho x 0,y x+y = 1.Tìm giá trị nhỏ của: P 3x 9y 103. log2 (x2 x 1) log2 (x2 x 1) log2 (x x2 1) log2 (x x2 1) 104. log2 (x2 3x 2) log2 (x2 7x 12) log2 Hoàng Ngọc Phú Page Phương trình mũ Logarit 107. log(x3 8) log(x 58) log(x2 4x 4) 109. log2 3x 1 log(x3) 110. log4 x 1 log 117. x3 0 x 1 x 114. log 51 x 5 .log(5x 4) log x log0,18 116. log2 x2 x log2 8 x 118. 0 112. log5 x log25 x log0,2 log0,04 x log0,2 x 120. log2 x 1 logx1 121. 3logx 16 log16 x log2 x 122. log 16 log2x 64 123. log2 (2x2 ).log2x 124. log 5 x . log x 125. x cos2 x logx 5x logx 127. logcosx 4.log 6 1 1 logx logx 119. logx log x x x log8 x 9 108. log4 log2 x log2 log4 x 111. (x 1).log5 log5 3x1 log5 11.3x 115. log2 1 log log2 (x 1) 113. log(x2 2x 3) log 106. log2 4.3x log2 105. 2(log9 x)2 log3 x.log3 ( 2x 1) 126. logsinx 4.log 1 sin2 x 24 128. log2(x1) 4(x 1) log x1 (x 1) 2 129. log x2 x log x 130. log 2 log2 4x x2 x 131. log x x2 14 log16x x3 40log 4x x 1 132. loga ax .logx ax log a a 133. log2 (3x 1).log2 (2.3x 2) 135. l og4 x 1 l og2 x 1 25 Hoàng Ngọc Phú với a ; a 1 134. log(logx) log(logx3 2) 136. log2 (x2 1) (x2 5).log(x2 1) 5x2 Page Phương trình mũ Logarit 137. 5logx 50 xlog5 138. 139. (log3 x)2 (x 4)log3 x x 141. log5 x3 x 140. log2 x 2x 1 log2 x 142. log2 x x 1 log2 x.log2 (x2 x) x 143. 3x + 5x = 6x + 144. 12.9 x - 35.6 x + 18.4 x = 145. x = x + 146. 2 147. 2 x 2 x 4 148. x x 6x 2x 18 2x 150. x + 33 x = 12. 149. 6x + = 2x + + 4.3x 151. 3 2 3x 3x 152. 2010x 2008x 2.2009x 153. 2x 1 5x1 154. 2x x 2x 2x x2 2 155. 2x x 22xx 156. x2 .2x 4x 4.x2 x.2x 2x 157. 6x 2x1 4.3x 2 158. 4x x 21x 2(x1) 159. 22. x3x 5.2 x31 2x4 x x 160. 34 43 2 161. 4x (x2 7).2x 12 4x2 162. 8x 7.4x + 7.2x + = 163. log3 x logx 164. log2 2x .log4 2x1 165. log22 x 3.log2 x 166. log3x 9x log x 3x 167. x.log5 log5 3x log5 3x1 168. 4log3 x xlog3 169. log3 x2 x log3 2x 5 170. log32 x (x 12)log3 x 11 x 171. 172. log2 x log2 x log2 x x log3 x 173. log22 x 3.log2 x log2 x2 174. log2 x.log3 x x.log3 x log2 x 3log3 x x 175. log3 2x log3 2x log3 2x2 Hoàng Ngọc Phú Page Phương trình mũ Logarit 176. log22 x log2 x.log2 x 1 3.log2 x 2.log x 1 177. 3.log3 x 2.log2 x 1 178. xlog3 x2 .2log3 x 7.xlog3 179. log2 4x log 180. log3 log27 x log27 log3 x 2x log3 x log3 x 181. 183. 2.log24 x log2 x.log2 x 1 184. log82 x2 log2 8x2 186. 3log2 x xlog2 18 187. x.log22 x 2(x 1).log2 x 188. 4x1 2x4 2x2 189. 2x5 4.3 190. 4.3 9.2 27 x 191. 8.3x 3.2x 24 6x 193. x 32 192. x x 5.6 72x x 6. 0.7 7 100x 194. 2x 128 2x 195. 4x 2x 196. 25x 6.5x1 53 197. 9x 5.3x 198. 9x 25.3x 54 199. 32x 32x 30 x1 200. 82.3x 201. 73x 9.52x 52x 9.73x 202. 9x 203. 9x 1 x x .8 x 205. 3x 1 1 36.3x 3 30 204. xlog2 x2 .3log2 x xlog2 6 206. 2.xlog2 x 2x3log8 x 6 log2 4 x2 207. x xlog2 xlog2 208. x 209. 4lg10x 6lgx 2.3lg100x 210. 125x 50x 23x1 1x 211. 4x x.3 182. log2 x.log3 x 3.log3 x log2 x 185. 6.9log2 x 6.x2 13.xlog2 4x8 x 2x .3 2x x x 1 .8 x x 212. x 2 500 213. 3x1 3x2 3x3 3x4 750 214. 7.3x1 5x2 3x4 5x3 215. 6.4x 13.6x 6.9x 216. 4x 82x1 217. 52x1 3.52x1 110 218. 3.4x 2.9x 5.6x Hoàng Ngọc Phú Page Phương trình mũ Logarit 219. 32x8 4.3x5 27 221. x 6.9 223. 6. x 13.6 2x 3 x 6.4 4 x2 3x 5 220. 7.3x1 5x2 3x4 5x3 222. 5x1 2x 5x 2x2 0 224. x 225. x log2 2x 227. x2 16 10.2 x 2 x 32x1 226. 25x 15x 2.9x x2 228. 22x x 9.2x x 22x2 12 229. 6.2 x1 x 2 230. 231. 52x 32x 2.5x 2.3x 232. 2x 233. 2x.5x1 102x 234. 235. 3.16x 2.81x 2.36x 236. 12.3x 3.15x 5x1 20 3x 1 x x x 1 2 244. 245. 2x 242. 2 2x 16 2 x x 3 240. log4 x 3 log4 x 1 log4 x2 2x 1 x 1 238. 3x 5x 6x 241. log5x x2 2x 65 243. 3x 3x 237. 4log2 2x xlog2 2.3log2 4x 239. 2x1 2x 1 9x 6x1 x2 2x 1 x x 101 10 4 2 lo2x x 2 log2 x x2 x2 x x2 4x x x x 1 1 1 246. 2x 2x 3 2 6 x 247. 5.32x1 7.3x1 6.3x 9x1 248. lg5 lg x 10 lg 21x 20 lg 2x 1 1 1 1 249. lgx lg x lg x lg x 2 2 8 Hoàng Ngọc Phú 250. lg2 x 3lgx lgx2 Page Phương trình mũ Logarit 252. log21 4x log2 251. log x log x 253. log 4x log5 2x 2 x2 8 254. log x x log 4x x 3log2x x3 256. lg lgx lg lg x3 255. log log32 x x 257. log3 x 1 log5 2x 1 258. log2 x2 log2 6x 10 259. 260. log 261. logx 4x2 .log22 x 12 262. logx x 1 lg 4,5 3 3 263. log2 x log2 x x x 264. x lg x2 x lg x x x 2 x 1 265. log2 x2 log2 6x 10 266. log 267. 2.log29 x log3 x.log3 2x 1 268. 3. log3 x log3 3x 269. lg x 10 lgx lg 270. log x3 2x x 271. log x x2 40log4x x 14 log16x x3 272. 3x2 x. logx 3 log 3 log x2 1 log x 2 log2 x3 1 273. log 274. 2 x 2x log2 x log2 2x logx 2x log2 x 2x log2 x 275. log2 x.log3 x.log5 x log2 x.log3 x log2 x.log5 x log3 x.log5 x 276. x 3 log32 x x log3 x 16 x3 log2 x 277. log3 3x .log2 x log3 278. log2 36 log2 81 log2 3x 4x15 log2 279. logx1 2x2 280. log22 x x 1 log2 x 2x 281. 4.log9 x logx 282. log2 x log2 x Hoàng Ngọc Phú Page Phương trình mũ Logarit 283. log2 x2 3x log2 x2 7x 12 log2 284. 286. 2.log6 287. log2 285. log5 5x .log25 5x1 x x log2 x2 x x x log4 x x2 x log 2 x2 x 288. log 2 log2 4x 289. log x log x3 log3 3x x 290. logx log 4x 292. log2 3x 1 0 291. log5 x log3 x log5 3.log9 225 logx3 log2 x 1 293. log2 4x x log 2x1 294. log2 x log7 x log2 x.log7 x 295. log4 x x2 .log5 x x2 log20 x x 297. logx 9x1 4.3x 3x 296. log2 9x 5.3x 298. logx log3 9x 299. log2 2x x log2 2x 12 300. log2 x 1 logx1 16 301. log2 x x 2 log2 x 302. log2 x2 log x 1 x2 303. log2 log3 log2 x 304. x2 lg2 x2 x2 .lg x 305. log32 x 1 x 5 log3 x 1 2x 306. log2 x x2 .log3 x x log6 x x 307. log4 x log x log8 x3 308. log5 5x .log25 5x1 16 309. log5 x log3 x log5 3.log9 225 Hoàng Ngọc Phú 310. log9 x 8 log3 x 26 Page Phương trình mũ Logarit 312. log3 x log3 x2 4x 311. x2 .logx 27.log9 x x 313. log12x 6x2 5x log13x 4x2 4x 315. log x 1 log log x log x 314. x2 lg2 x2 x2 lg x 25 316. x log32 x 1 x 1 log3 x 1 16 317. 3 log x log x log x 4 x3 318. log3 .log2 x log3 log2 x x 319. log3x7 12x 4x2 log2x5 6x2 23x 21 320. x2 .log6 5x2 2x x log 5x 2x x 2x 321. log2 x.log3 x log3 x3 log2 x 322. x 3 .log2 x 1 logx1 x 3 .logx1 log2 x x 323. log22 x x log7 x 3 log7 x 3 log2 x 2 1 x 1 1 x 324. 3 3 326. lg lg3 lg x 27 2x 328. log2 4x1 .log2 4x log 330. log4 log3 1 log2 1 3log3 x 332. logx3 2x x Hoàng Ngọc Phú x 325. lg 3x 24x lg16 lg 4 12 327. log2 4x x log2 2x3 329. log 2x 1 2x 331. log92 x log3 x.log3 17x2.x2 2x Page 10 Phương trình mũ Logarit x2 - x x-1 = (x - 1) x2 + x + 891. log3 = x2 + 3x + 2x + 4x + 890. -2 892. log2 x2 + x + = x2 - 2x2 + x + 893. 2log29 x = log3 x.log3 ( 2x + - - x2 - 2x 2 1 894. x - x = x 896. log5 x3 +2 log5 x2 =x+x log5 898. log3 ( x - 3x + + 2) + (0,2) 899. 901. 2x2 + 2x + x 1 903. log ( x 1) - 28.3 x2 + x 3x - x2 - log x 1 905. (2 log3 x)log9 x log x 2 2x 2x + = 2x2 - 6x + (x - 1)2 902. log (4 x 15.2 x 27) log 4.2 x 0 904. log3 ( x 1)2 log (2 x 1) 1 log3 x 907. log x 2log x log 897. log2 900. log x1 (2 x2 x 1) log x1 (2 x 1)2 +9=0 x 2x - = 3x2 - 8x + (x - 1)2 =2 1 2 895. log3 906. 3.8x 4.12x 18x 2.27 x 908. log x log (3 x) log8 ( x 1)3 909. 9x x 1 10.3x x2 910. 2x x 4.2x x 22 x 1 911. log3 3x 1 log3 3x 1 3 913. x 1 915. x 1 2x x 912. log x 1 log x log 2x 18 x 1 1 x x 2 2 2 914. x x1 x 1 ( x 0) CM n0 x 916. log5 5x x 22 x x 917. 16log 919. .3 27 x2 918. log x 3 log x 18 log x x 3log3 x x x 1 .5 x 2 12 920. log log x log log x 921. log log log x log log log x 922. log log x log log x log log x 924. lg x 50 x lg5 Hoàng Ngọc Phú 925. log5 ( x 3) 923. x x 926. lg2 x 3 lg x 4,5 log32 x 102 lg x x log3 x 162 Page 27 Phương trình mũ Logarit x x 2 927. 36.32 x 928. log x log 52 x x log x x log x 929. log 5 x . log x 930. 931. log sin x 4. log sin2 x 932. log cos x 4. log cos x 936. log x 16 log x 64 933. log ( x 1) 4( x 1) log x 1 ( x 1) 935. log x 16 log 16 x log x 934. log x log 937. log 2 x x x log 2 x2 x 938. log x log x log x log x log x log x 1 10 sin x 2 cos x 1 939. 940. x 942. 2x 1 x 5 cos x sin x lg 52 sin x 2 cos x 1 x 40 941. 2 x x x 20 944. x 16 x 16 943. 24 945. 1/ x 948. x x x 24 10 x 3 2 2 52 tan x 10 949. 6.9 13.6 6.4 10 x x x sin x sin x log 7 x 2 sin x cos x 951. log x 3 x x 953. log 3 x 1 x tan x 61 / x 91 / x 950. log 7 x 12 5 947. 5 x 3 3 3 x 946. x 3 x 1/ log x 3 2 x x2 log x 1 954. log x log x 952. log x 2 x log x 1 3 955. log x 1 4.3 x 3x 956. log x 1 log x 1 Hoàng Ngọc Phú Page 28 Phương trình mũ Logarit 967. log x 1 958. log sin x x 15 x 1 log log x 3 x 1 962. log x 7 12x x 963. x x sin x log sin cos x 2 3 959. log 27 x x 960. 2 . log x log / log 2 x 961. log 6 x x 3 x x 965. 20 x x x x 966. x 1 3 5 2x x 1 3 x x 1 5 2,9 x x log x 1 x 2x 969. x x log ( x 1)2 971. x x 2 x 1/ x 5 2 967. 2 5 x 2 968. log 23x 21 964. x x log2 2.3 log2 x x x 970. 12 x 2 x2 972. 12.3 3.15 x x x 1 x 2 2x 20 974. log cot x log cos x 973. log2x+2log7x=2+log2x.log7x 975. log x x 1 lg 1,5 x2 976. lg x x x x lgx 3 x 977. x log ( x 1) 4( x 1) log ( x 1) 16 978. 3.25 x 2 (3x 10)5 x 2 x 979. ln 2 x 3 ln x 980. x2 x8 ln2 x 3 ln(4 x 13x 4 981. x2 6x ) 16 982. 2x 2x1 2x2 3x 3x1 3x2 983. 2x.3x1.5x2 12 984. (x2 x 1)x 985. ( x x2 )x2 986. (x2 2x 2) Hoàng Ngọc Phú 1 1 x2 1 Page 29 Phương trình mũ Logarit 987. 34x8 4.32x5 27 988. 22x6 2x7 17 989. (2 3)x (2 3)x 990. 2.16x 15.4x 991. (3 5)x 16(3 5)x 2x3 992. (7 3)x 3(2 3)x 993. 3.16 2.8 5.36 x x x 994. 8x 3x 3 2 x 12 995. 5x 5x1 5x2 3x 3x1 3x2 996. (x 1) 997. 3x 4x 5x 999. x2 (3 2x )x 2(1 2x ) 998. 3x x x 3 1 1000. 22x1 32x 52x1 2x 3x1 5x2 1001. log5 x log5 x log5 x 1002. log5 x log25 x log0,2 1003. logx 2x2 5x 1004. lg(x2 2x 3) lg x3 0 x 1 1005. .lg(5x 4) lg x lg 0,18 1006. 1 lg x lg x 1008. 1007. log2 x 10log2 x 1009. 3logx 16 4log16 x 2log2 x log0,04 x log0,2 x 1010. logx2 16 log2x 64 1012. log3 log9 x 1011. lg(lgx) lg(lgx3 2) 9x 2x 1013. log2 4.3x log2 9x 1014. log2 x1 .log2 x log 1015. lg 6.5x 25.20x x lg25 1016. lg2 1 lg x lg 51 lg2 x lg x2 x 1 1017. x lg 5x x lg2 lg3 1019. x Hoàng Ngọc Phú x 5 1018. 5lgx 50 xlg5 1020. 3log3 x xlog3 x 162 Page 30 Phương trình mũ Logarit 1021. x lg x2 x lg x 1022. log3 x 1 log5 2x 1 1023. x log32 x 1 x 1 log3 x 1 16 1024. log5 x 3 x 1025. x lg x x lg( x 2) 1026. log x log ( x 1) log ( x 2) log ( x 3) x3 x 1 1027. 2x 2x1 2x2 3x 3x1 3x2 1028. ( 10 3) x1 ( 10 3) x3 1029. 8.3x 3.2x 24 6x 1030. 2x x 4.2x x 22 x 1031. 9sin x 9cos x 10 1032. x 5 x 1033. x 5 x 2 x 2 1034. x 4 x 2 16 10.2 x3 x 12 1035. 6.9 x 13.6 x 6.4 x 1036. 3.42 x 2.34 x 5.36x 1037. (3 5) x 16.(3 5) x 23 x 1038. 32 x 6 x9 4.15x 3 x5 3.52 x 6 x9 1039. 3.8x 4.12x 18x 2.27 x 1040. 2x x 22 xx 1041. ( 1) x ( 1) x 2 1042. 4.3x 9.2x 5.6 1043. 22 x 1 9.2x x 22 x2 1044. 25x 15x 2.9x 1045. 125x 50x 23x1 1046. 4x 3x2 4x 6 x5 42 x 3 x7 1047. ( )cos x ( )cos x 1048. 23 x 6.2 x x x 3( x1) 12 1 2x 1050. 3.9x1 (3x 7).3x1 x 1049. x x 1051. ( 2) x ( 2) x 10 1052. 3.25x2 (3x 10).5x2 x 1053. x2 (2x 3) x 2(1 2x ) 1054. e x5 e x1 1 2x x 1 1055. 23x 3x.22 x (1 3x2 ).2x x3 x 1056. 22 x1 32 x 52 x1 2x 3x1 5x2 1057. (2 3) x (2 3) x x 1058. 2x1 2x x ( x 1)2 1059. 2x1 4x x 1060. ( 2) x ( 2) x ( 5) x 1061. 3x 5x x 1062. 3x x2 x Hoàng Ngọc Phú 1063. 3x 3x Page 31 Phương trình mũ Logarit 1064. 2x 2x x2 x 1065. 8sin x 8cos x 10 cos y 1066. 4sin x 21sin x cos( xy) y 1067. 3x x 1068. x x2 x 3x1 1069. 27 x (6 x2 x 1).9x 1070. x x 10 x 1071. log (1 x 1) 3log x 40 1072. log ( x 2) 6log 3x 1073. log x log (3 x) log8 ( x 1)3 1074. log ( x 1) 1075. log (4 x 15.2 x 27) 2log 0 4.2 x log x1 log x 2 1076. log ( x 2).log x 1077. log2 ( x2 3x 2) log ( x2 x 12) log 1078. 2log92 x log3 x.log3 ( x 1) 1079. log2 x log3 x log2 x.log3 x 1080. log5 x log3 x log5 3.log9 225 1081. log ( x 1)2 log x log8 ( x 4)3 1082. log 2 ( x2 x)2 log 2 ( x2 x) 1083. log9 ( x x 6)2 log x 1 log x 1084. log x log (8x) 1085. log2 ( x 1) log x1 1086. log x (2 x) log 1087. log3 (3x 1).log3 (3x1 3) 2 x x2 1088. log12 x (6 x2 5x 1) log13 x (4 x2 x 1) 1089. 4lg(10 x ) 6lg x 2.3lg(100 x ) 1090. xlog x2 .3log x xlog 1091. log x log x 1092. log22 ( x 1) 6log x 1093. 4log9 x log x 1094. lg4 ( x 1)2 log2 ( x 1)3 25 1095. log 2 log x 1096. log5 (5x 1).log25 (5x1 5) x 1097. 4log 2x xlog2 2.3log2 x 1098. log2 x1 (2 x2 x 1) log x1(2 x 1)2 1099. log3 x7 (9 12 x x2 ) log x3 (6 x2 23x 21) 1100. (2 2)log x x(2 2)log x x2 Hoàng Ngọc Phú Page 32 Phương trình mũ Logarit 1101. log ( x x2 1).log5 ( x x 1) log 20 ( x x 1) 1102. log x log (8x) 1103. log2 ( x 1) log x1 1104. log x (2 x) log 1105. log3 (3x 1).log3 (3x1 3) 2 x x2 1106. log12 x (6 x2 5x 1) log13 x (4 x2 x 1) 1107. 4lg(10 x ) 6lg x 2.3lg(100 x ) 1108. xlog x2 .3log x xlog 1109. log x log x 1110. log22 ( x 1) 6log x 1111. 4log9 x log x 1112. lg4 ( x 1)2 log2 ( x 1)3 25 1113. log 2 log x 1114. log5 (5x 1).log25 (5x1 5) x 1115. 4log 2x xlog2 2.3log2 x 1116. log2 x1 (2 x2 x 1) log x1(2 x 1)2 1117. log3 x7 (9 12 x x2 ) log x3 (6 x2 23x 21) 1118. (2 2)log x x(2 2)log x x2 1119. log ( x x2 1).log5 ( x x 1) log 20 ( x x 1) 1120. x log5 (5x1 20) 1121. 3log3 (1 x x ) 2log x 1122. 2log3 tan x log sin x 1123. 2log6 ( x x ) log x 1124. x log2 (9 2x ) 1125. 2log6 ( x x ) log x 1126. 2log3 cot x log cos x 1127. lg( x2 x 12) x lg( x 3) 1128. log22 x ( x 3).log2 x x 1129. x2 (log3 x 3) x log3 x 1131. log22 x ( x 1)log x x 1130. ln( x2 x 1) ln(2 x2 1) x2 x 1132. log3 x2 x x 3x 2 2x 4x 1134. log ( x 1) log ( x 1) x x 1133. log ( x2 3) log x2 3 x x2 1135. log22 x 2( x 1)log x x2 x 1136. x2 6x 16 1138. (x2 x 1)x Hoàng Ngọc Phú 1 1 1137. 2x 2x1 2x2 3x 3x1 3x2 1139. ( x x2 )x2 Page 33 Phương trình mũ Logarit x2 1140. (x2 2x 2) 1141. 34x8 4.32x5 27 1 1143. (3 5)x 16(3 5)x 2x3 1142. (2 3)x (2 3)x 1144. (7 3)x 3(2 3)x 1146. 2.4 x 6x 1145. 3.16x 2.8x 5.36x 9x 1147. 1148. 5x 5x1 5x2 3x 3x1 3x2 1153. log3 x 1 log5 2x 1 1154. x log32 x 1 x 1 log3 x 1 16 1157. x3 0 x 1 1156. 1 lg x lg x 1161. log3 log9 x x lg 51 x 5 log32 x 4.2 x lg2 x lg x2 x 1 0 x 1 log x 1172. log2 x + log3 x + log4 x = log5 x Hoàng Ngọc Phú 1169. log22 x 1 log2 x 1170. log 4x 15.2 x 27 log 2 1164. lg 6.5x 25.20x x lg25 1167. x xlog3 x 162 1171. log x x 6 log 1166. x lg 5x x lg2 lg3 1168. .lg(5x 4) lg x lg 0,18 1162. log2 4.3x log2 9x 1163. log2 x1 .log2 x log 1165. lg2 1 lg x 1160. lg(lgx) lg(lgx3 2) 9x 2x log5 x 3 1158. log2 x 10log2 x log0,04 x log0,2 x 1159. 12 1151. 22x1 32x 52x1 2x 3x1 5x2 1152. x lg x2 x lg x 1155. lg(x2 2x 3) lg 3x 3 2 x 1149. 3x 4x 5x 1150. x2 (3 2x )x 2(1 2x ) 8x 1173. log4(log2 x) + log2(log4 x) = Page 34 Phương trình mũ Logarit x x 1175. 48 48 14 1174. 3.log2x.log4x.log8x.log16x = 1176. 3. log x log 3x 1178. 16 x3 x 64 x3 x x3 32 log log 21 x x 2 1180. log 42 x log 21 1181. x 3 x 4x x 5 42x 3 x 1182. lg x 12 lg x 13 25 1 1183. log2 x.log3 x = 2log2 x + 3log3 x –6 1184. x 1log log 3 x1 3 log 11.3 x 9 1185. 32 x 1186. log x 2. log 10 x 1187. log x log x log x 1189. log x 42 log log x 6 x 3 6x 3 x 1 22x 6 x 3 2 x 1 log 1191. log4 x log4 x 32 10 log x 32 1190. lg x x x lgx 2 1192. log3 x log3 2x log x 1 1193. log 21 5 2x log 5 2x . log 2x 1 5 2x log 2x 52 log 2x 1. log 5 2x 1194. x x 21x x 1 1196. 16 x3 x 64 x3 x 1195. 3x x 2.3x x 32x 1197. 3.25 x2 3x 105 x2 x x3 32 log log 21 x x 2 1198. log 42 x log 21 1199. lg x 12 lg x 13 25 1200. log2 x.log3 x = 2log2 x + 3log3 x –6 1201. x 1log log 3 x1 3 log 11.3 x 9 1202. 32 x 6 x 3 6x 3 x 1 22x 6 x 3 1203. log x 2. log 10 x log x 1204. log x log x log x 1205. 3x + 4x = 5x 1206. 9x + 2( x –2).3x + 2x –5 = 1207. 25x –2(3 –x ).5x + 2x –7 = 1208. log 32 x 1 x 5log x 1 x 1209. log Hoàng Ngọc Phú x x log 64 x Page 35 Phương trình mũ Logarit 1210. log log x log log x 1211. log log log x log log log x 1212. log log x log log x log log x 1213. log log x log log x 1214. xlg x2 3 lg x4,5 102 lg x log x x log x 1215. 1216. log sin x 4. log sin x 1217. log cos x 4. log cos x 1218. log 2( x1) 4( x 1) log x1 ( x 1) 1219. log x log 9x 6 1220. log x 16 log16 x log x 1222. log 2 x 1 x log x 1 x 2 1223. log x log x log x log x log x log x 1225. log 7 x 1221. log x 16 log x 64 2 x 1228. log 3x 1 tan x 52 sin x sin x log 7 x 2 sin x cos x 1227. log x 2 x log 1224. tan x 10 1226. log x3 x x / x2 log x3 log x 1 1229. log 4 x 4 x log 2 x 1 3 1230. log 9x 1 4.3x 2 3x 1231. log x 1 log x 1 1232. log 4 x1 4. log 4 x 1 log1 / 1233. log sin sin x log sin cos x x x x 1 log x 3 1234. log 27 x x 6 log 1235. log x7 9 12 x x log x3 6 x 23x 21 1236. x lgx x 6 lg( x 2) 1237. log x log ( x 1) log ( x 2) log ( x 3) 1238. x 2log 32 ( x 1) 4( x 1) log ( x 1) 16 1239. ln 2 x 3 ln 4 x ln 2 x 3 ln(4 x ) 1240. lgx2 x 6 x2 x lgx 3 3x 1242. x 3 2x x 21 2x Hoàng Ngọc Phú 1241. 4log 1 10 1243. 22 sin x2 cos x1 2x xlog2 2.3log2 x cos xsin xlg 52 sin x2 cos x1 Page 36 Phương trình mũ Logarit 1244. 432cos x 7.41cos x 1245. 16x 1246. 4log9 x 2log9 x 2log3 27 1247. sin x 1248. 9 cos2 x 10 10.3x x2 1 1253. 1 log3 x 1256. log (4 x 15 x 27) 2log 3 73 x x 3 3 x2 2 x x 1 2 12 x 25x 9x 15x 1255. 0 2x 1257. log22 ( x 1) 6log x 1258. log2 x1 (2 x2 x 1) log x1 (2 x 1)2 x 1259. 14.2 x 1261. x2 2 x x 1254. log3 x log9 x 64 4x 1251. 4x 6.2x x 1 1 1249. 64 1250. 4cos2 x 4cos x 1252. 9x 1260. 2 x 2 2 x x log x log 27 x log x log81 x 1262. log 2 1263. 42 x x2 x 42 x2 1264. log x 5x log 1265. log x 3 x x 1267. log 2 + log 2 x - 3x + 2x x 4 x-1 = log7 4 (x + 2) (x ) x 1 log x 3 1266. log x x 1 log x x x x 3x log 2 x log 74 x 2 1269. x lg4 x x lg lg 1268. log 52 x log x 1270. log (3x 1) 1271. log x x x .log x x log 25 x x 1 x log ( x 1) log x 3 1272. log x 7 4 x 12 x 9 log x3 6 x 23x 21 1273. log x 2 log x 2 x log x x log x log log x x 1274. ln(2 x) ln( x 2) ln( x 3) ln Hoàng Ngọc Phú 1275. log x 12 log x log 4 x Page 37 Phương trình mũ Logarit 1276. log {2 log [1 log (1 log x)]} 1278. lg( x 8) lg( x 58) 1277. log cos x 4. log cos2 x lg( x x 4) 2 1280. log (2 x ). log x 1279. ( x 2) log3 ( x 2 ) 9( x 2) x x 1281. log (3 1).log (2.3 2) 1282. log a (ax). log x (ax) log a ( ),0 a a 2 2 1283. lg ( x 1) ( x 5).lg( x 1) 5x 2 1284. log [ x( x 1) ] log x. log ( x x) x 1285. log x 1287. log ( x log6 x 1286. 1 log x x ) log x 1288. log ( x x 1) log ( x x 1) log ( x x 1) log ( x x 1) 1289. log ( x 3x 2) log ( x x 12) log 1291. (2 ) log2 x x.(2 ) log2 x x 1290. log (4 x x ) log x 1292. 2 x log x log 1293. log x log x 1294. log ( x x 1) log ( x x 1) log ( x x 1) 1295. log ( x x 1) log ( x x 1) log 20 ( x x 1) 1296. log ( x x ) log (4 x x ) 1297. tg xy cot g xy log (4 x x 3) 1298. x log x .3log x x log 1299. log ( x 1) log log ( x 2) log ( x 2) 25 1300. ( x 2) log 32 ( x 1) 4( x 1) log ( x 1) 16 x 1301. log log x log x3 log x 1302. log x (2 x) log 2 x x2 1303. log (4 x 4) x log (2 x 1 3) Hoàng Ngọc Phú Page 38 Phương trình mũ Logarit 1304. log x7 (9 12 x x ) log x3 (6 x 23x 21) 1305. log (3x 1) log x 3 log ( x 1) 1307. log (9 x1 4.3 x 2) 3x 1 1309. log 27 ( x 5x 6) log 1310. log ( x 1) log 1306. log x log (9 x 6) 1308. log 2 x x log 2.3log x2 x 1 log ( x 3) 2 x log (4 x) 1311. log ( x x 1) log x x x 1312. log2(x2+x+1)+log2(x2-x+1)=log2(x4+x2+1)+log2(x4-x2+1) 1313. ( x 1) log log (3 x1 3) log (11.3 x 9) 1314. log ( x 5x 6) log x 1 log x 1315. log x x 14 log 16x x 40 log x x x x 1316. log (sin sin x) log (sin cos x) 1318. log a (1 x ) log a (3 x ) 1317. log x x (3 x) 1319. log3(2x+1)+log5(4x+1)+log7(6x+1)=3x 1320. log ( x 8x 14) log x 4 x4 1 1321. lg x lg x lg x 1323. log 2 1324. log 7 x 1325. 1326. 1322. log x ( x x ) ( x x 2) log 2 ( x x 3) sin x sin x log 7 x 2 sin x cos x 1 x2 1 x2 1 1 11 2x 2x log ( x x ) 1 x2 1 x2 1 1 2x 2x 3x log (3x 5) Hoàng Ngọc Phú 25 (2 5x x ) 1327. 2x (2 x 1) log1 (1 x x ) Page 39 Phương trình mũ Logarit 1330. x log x 365 x 1332. 2.9 1334. x lg x x log2 x x lg x 3 1331. (2 ) log x x(2 ) log x x log2 1335. ( ) log 1 x 1 1 x 1 , 25 ( x 5 x 8 ) 1336. log x (cos x sin x) log (cos x cos x) 1337. x 1 x 1340. x 9 x x 2x x 5 x 1 2,5 1 x x 1 4 x 1339. ( x x 1) x2 x 5 6 52 6 x 3 3 x 1432. 1333. log (3.2 x 1) x 1338. ( x x 2) log 27 125 log271 ( x 1) ) 27 log 243 1329. ( ) log ( x 1) ( 1328. 2log x 21log x 2log x1 x 1341. 1433. x x 10 x x 10 x x x x x 1 1 1 1435. x 2 x 3 2 6 1434. x x x x 4 1436. 2 x x 5 1440. x x log4 x 1442. 1444. x 3 xx x 1438. 1439. ( x 4) x log4 x 3 5 x 6 1441. x .2 x1 ( x)x 1437. x log2 x .3log2 x x log2 x3 2 x .2 x3 4 x1 log (4 x) 1 1443. log (3 x) log (3 x) x log( x 1) 2 log ( x 1) log( x 1) 1446. log x log x. log 1 x2 log x 1445. log x x ( x 4) log x 6 ( x 4) x 1447. log (1 ) log x 0 1448. log (1 x 5x ) log ( x 5x 7) 1449. ( )cos x ( )cos x 1450. log ( x 3x 2) log ( x x 12) log 1451. log(10 x ) 6 log(10 x ) Hoàng Ngọc Phú 2.3 log(100x ) 1453. log x log ( x 2) Page 40 Phương trình mũ Logarit 1452. log ( x 5x 6) log x 1 log x 1454. log12 x (6 x 5x 1) log13x (4 x x 1) 1455. log ( x 1) log 1456. log x log x 1458. log (3x 1) x log ( x 4)3 1457. log 2 log x x log ( x 1) log x3 1459. log ( x x 1). log ( x x 1) log 20 ( x x 1) cos x x 1460. 1461. 1462. 1 1463. 3 x x1 3x 1466. 9.7 x x log x log x 3 log x 40 x x 1 1 log x log x 10 2 log x Hoàng Ngọc Phú 2x 2 x 1 log1 1 x 2. x x2 x x 21x 14 1471. log 2x 4x .(log x 1) 1474. log x log x log x 1478. e x 4e 2 x 1479. 6.4 13.6 6.9 log2 x 3 log x 1476. log log x log log x 1477. 2 x1 2 x3 64 1483. x 1 x x 1 1473. ln x 1 ln x lnx 7 1481. x2 1465. 5x.x1 8x 100 1469. x cos x 27 x 81x 3 1472. x 1.log ( x 1) 1475. 1467. cos x 2 x x 1468. 1470. log x 1 x 3 x x 1464. 23 x 1480. x 18 x 2.27 x 1482. ln x ln x ln x 1484. log x log x Page 41 Phương trình mũ Logarit 1486. log x x 5 log x x 5 1485. 2 x x 2x 18 1487. x1 x1 2 x1 1488. log xx 12 log x.log x x 1489. log 22 x log x 1490. x x 1491. 42 x 23 x1 x3 16 1492. 3cos x 2cos x cos x 1493. 4log x 2log x x 1494. 3cos x 3sin x x 22 1497. x2 1 x 2 x2 1 x 1498. x 2 18 x 32 x 12 x 16 x x x x x 2x 27 36 48 64 2x 1 1500. x 2 2x 1 1499. x x log x 12 1501. 2.2 1496. log x log x 1 log x 2 log x 3 1495. x2 3x2 32 x1 22 x1 1 x x 3x x2 2 x 1 2 log 2 x 1502. 3x x ln x 3 x x ln x 4 x x ln x 5 3x x ln x 4 x x ln x 5 x x ln x 3 Hoàng Ngọc Phú Page 42 [...].. .Phương trình mũ và Logarit 334 log 5 1 log 5 5 1 335 log x 1 2 log 4 x log 4 x 336 log x x 1 log x x 1 log x x 1 log x x 1 333 Tìm x biết... log3 x.log3 ( 2x 1 1) 3 355 log2 4.3x 6 log2 2 2 9 x 6 1 1 356 log(x3 8) log(x 58) log(x2 4x 4) 2 Hoàng Ngọc Phú 357 log4 log2 x log2 log4 x 2 Page 11 Phương trình mũ và Logarit 358 log2 3x 1 1 2 log2 (x 1) log(x3) 2 359 log4 x 1 2 log 4 x log8 4 x 2 3 2 360 (x 1).log5 3 log5 3x1 3 log5 11.3x 9 362 log(x2 ... 2) 0 385 log2 (x2 1) (x2 5).log(x2 1) 5x2 0 log5 x3 386 5logx 50 xlog5 387 2 388 (log3 x)2 (x 4)log3 x x 3 0 389 log2 x 2x 2 2 Hoàng Ngọc Phú x Page 12 Phương trình mũ và Logarit 390 3 1 2x 1 log2 x 2 391 log2 x x 1 log2 x.log2 (x2 x) 2 0 392 log 1 2 x3 x2 2 log3 2x 2 0 3 1 393 log4 2log3 1 log2 1 3log2... 410 lg2 x2 1 x2 5 lg x2 1 -5x2 0 412 2 411 log2 x x-1 log2 x2 x -2 0 3 log2 x2 4x 5 2 5-log2 x2 4x 5 6 Hoàng Ngọc Phú Page 13 Phương trình mũ và Logarit 413 9 lg2x2 3lgx 2 x 414 x-2 102 lgx x 2 420 x 3 2 421 log2x 2x 2 2 423 2 log2 x1 425 x 1 log2 x 427 3 422 log2 4 x1 log2 3 x log2 x x log2... 4 x log 3 x 16 0 2 2 443 log 3 x log 3 x 1 4 1 0 444 2 x 445 3.8x + 4.12x - 18x - 2.27x = 0 446 2x Hoàng Ngọc Phú 2 x 2 x 22 x x 3 2 4.2x 2 x 22 x 4 0 Page 14 Phương trình mũ và Logarit 447 1 log 2 2 x 3 1 log 4 x 18 log 2 4 x 448 16 log 27x x 3 log 3 x x 2 0 3 4 449 log 5 5x 4 1 x 450 4x 451 log 4 log 2 x log 2 log 4 x 2 452 3... log 5 11.3x 9 1 2 3 2 2 1 2 2 1 2 2 0 log9 x 2 2 466 7 4 3 1 x2 2 x 1 2 481 x log 2 x3log 2 x3 1 2 x 483 log 2 x ( x 1) log 2 x 6 2 x 2 2 log 4 x Page 15 Phương trình mũ và Logarit 485 log 1 x 1 log 1 x 2 486 1 log 1 7 2 3 log 1 x 2 4 487 log2 x 2 2 3 1 3 log 1 4 x +log 1 x 4 2 x (1) 2 log4 x 5 6 3 (1) 4 2 log 1 8 0 (1) 2 488 log2 x 2 log2 x 5 log 1 8 0 2 489 log4... 4 log 2 (4 x 4 x 3) 509 x log 9 x 2 3log x x log 3 2 2 2 2 510 log 2 (1 x ) log 3 x 511 log 5 ( x 2 1) log 1 5 log 5 ( x 2) 2 log 1 ( x 2) 5 Hoàng Ngọc Phú 25 Page 16 Phương trình mũ và Logarit 2 512 ( x 2) log 3 ( x 1) 4( x 1) log 3 ( x 1) 16 0 1 2 513 log x ( x 1) lg 1,5 514 log x 3 (3 1 2 x x 2 ) 515 log 2 (9 2 ) 3 x 3 x3 1 516 log 3 log 2... log 2 x 540 log 3 x x (3 x) 1 541 log a (1 1 x ) log a (3 1 x ) 542 log3(2x+1)+log5(4x+1)+log7(6x+1)=3x 543 log 3 ( x 2 8x 14) log x 2 Hoàng Ngọc Phú 2 2 4 x4 9 1 Page 17 Phương trình mũ và Logarit 1 4 545 log 1 x ( x 2 x 2 ) 544 lg 1 x 2 3 lg 1 x lg 1 x 2 2 2 546 1 1 lg( x 2) x 8 2 548 log 7 x 549 2 3 ( x 2 2 x 2) log 2 3 ( x 2 2 x 3) 3 sin... log2(6x+2.32x+2)=2x+2 574 (2 x 1) 2 x Nghiệm x thộc miền xác định của hàm số y= lg(4x-1) 575 (2 x 1) 2 x Nghiệm x thộc miền xác định của hàm số y= ln(x2- x-2) Hoàng Ngọc Phú Page 18 Phương trình mũ và Logarit 576 logaaxlogxax= log a 2 1 a với 0 . Phương trình mũ và Logarit Hoàng Ngọc Phú Page 1 PHƯƠNG TRÌNH MŨ VÀ LOGARIT 1. x1 x x 5 .8 500 2. x x 1 x 2 x x 1 x 2 5 5 5. 1 35. log 3 log 5 22 x x x 36. log 3 log 7 22 x x x 2 Phương trình mũ và Logarit Hoàng Ngọc Phú Page 2 37. 5 2 x 6x 2 2 16 2 38. x2 2x 1 3 0,25.4 16 . 4 42 76. 1 x 1 2 lg2 1 lg3 lg 3 27 0 2x Phương trình mũ và Logarit Hoàng Ngọc Phú Page 3 77. x x 3 22 log 4 1 x log 2 6 78.