Bµi tËp chuyªn ®Ò: Giíi h¹n hµm sè Duy Chung - THPT Mª Linh gioi han ham so-Bai tap-2011.doc - 1 - 12/14/2011 I Giíi h¹n d¹ng 0 0 1. 2 2 3 5 6 lim 8 15 x x x x x 2. 3 2 4 2 2 2 4 8 lim 8 16 x x x x x x 3. 0 (1 )(1 2 )(1 3 ) 1 lim x x x x x 4. 3 4 2 1 3 2 lim 4 3 x x x x x 5. 5 2 5 0 (1 ) (1 5 ) lim x x x x x 6. 3 2 4 2 lim 2 x x x 7. 3 3 0 1 1 lim x x x x 8. 3 1 1 lim 1 x x x 9. 2 2 1 3 2 4 2 lim 3 2 x x x x x x 10. 4 3 1 1 lim 1 x x x 11. 3 8 2 4 lim 2 x x x 12. 1 2 2 1 3 lim 1 x x x x 13. 2 2 2 1 2 6 2 2 lim 4 3 x x x x x x x 14. 2 2 0 1 1 lim 16 4 x x x 15. 1 2 1 lim 1 x x x x 16. 3 1 3 2 lim 1 x x x x 17. 2 3 1 3 2 lim 1 x x x 18. 2 3 2 4 lim 2 3 2 x x x 19. 3 2 3 2 1 2 1 lim 1 x x x x x 20. 0 9 16 7 lim x x x x 21. 4 7 9 2 lim 7 x x x 22. 3 2 1 7 3 lim 3 2 x x x x x 23. 0 2 1 8 lim x x x x 24. 3 0 2 1 1 3 lim x x x x 25. 3 0 1 1 lim x x x x 26. 3 2 2 11 8 43 lim 2 3 2 x x x x x 27. 33 2 2 1 5 7 lim 1 x x x x 28. 3 2 2 8 11 7 lim 3 2 x x x x x 29. 3 2 4 2 0 1 1 2 lim x x x x x 30. 3 3 2 1 7 3 lim 1 x x x x 31. 5 4 1 2 1 2 lim 1 x x x x 32. 43 0 1 1 3 4 lim 1 1 2 x x x x 33. 34 6 1 4 5 8 21 lim 1 x x x x 34. 3 5 4 0 1 4 . 1 6 . 1 8 . 1 10 1 lim x x x x x x 35. 2 3 0 1 1 1 lim x x x x 36. 3 2 0 2 1 1 lim sin x x x x 37. 3 4 7 2 20 lim 9 2 x x x x 38. 3 2 0 4 1 1 6 lim x x x x 39. 3 3 44 0 27 1 81 1 lim x x x x Bµi tËp chuyªn ®Ò: Giíi h¹n hµm sè Duy Chung - THPT Mª Linh gioi han ham so-Bai tap-2011.doc - 2 - 12/14/2011 II Giíi h¹n d¹ng 40. 3 2 4 3 2 2 3 4 1 lim 5 2 3 x x x x x x x 41. 5 3 5 4 2 5 7 4 3 lim 5 7 1 x x x x x x x 42. 2 2 2 3 (2 1)(3 2) lim 2 1 4 x x x x x x x 43. 32 2 54 4 4 9 9 6 5 lim 16 3 8 7 x x x x x 44. 2 2 3 2 (2 3) .(4 7) lim (3 1).(10 9) x x x x x 45. 30 25 55 (2 3) .( 7) lim (3 1) x x x x 46. 4 ( 1)( 2)( 3)( 4) lim (3 1) x x x x x x 47. 2 3 3 2 4 3 7 lim 27 5 4 x x x x x x 48. 5 3 1 lim 1 x x x x 49. 2 2 lim 3 1 x x x x x x 50. 35 24 5 4 3 1 2 lim 1 2 x x x x x 51. 2 2 4 5 2 1 lim 3 2 7 x x x x x x x III Giíi h¹n d¹ng 52. lim x x x x x 53. lim x x x x x 54. lim x x x x x x x 55. 2 lim 2 5 4 4 1 x x x x 56. 3 3 3 2 3 lim 7 8 x x x x x 57. 3 4 lim ( 5)( 6)( 7) ( 1)( 2)( 3)( 4) x x x x x x x x 58. 2 2 lim 1 1 x x x x x 59. 2 2 33 lim 1 ( 1) x x x 60. 3 2 lim 1 x x x 61. 2 2 lim 4 7 1 4 8 1 x x x x x 62. 3 2 lim 2 1 x x x IV Giíi h¹n d¹ng 0. 63. 2 lim . 1 x x x x 64. 32 4 6 lim . 9 7 27 5 x x x x 65. 3 3 3 2 lim . 1 1 x x x x 66. 32 9 124 lim . 8 1 16 3 x x x x 67. 2 2 lim . 2 2 x x x x x x x 68. 2 lim . 2 x x x x 69. 2 lim . 4 9 2 x x x x 70. 2 lim . 9 1 2 x x x x 71. 32 3 lim . 1 1 x x x x 72. 2 4 4 lim . 3 5 2 x x x x 73. 32 2 3 lim . 1 5 2 x x x x x Bµi tËp chuyªn ®Ò: Giíi h¹n hµm sè Duy Chung - THPT Mª Linh gioi han ham so-Bai tap-2011.doc - 3 - 12/14/2011 V Giíi h¹n lîng gi¸c: cho 0 sin lim 1 x x x 1. 1 lim ( 1) sin 1 x x x 2. 2 1 1 lim ( 1) sin 1 x x x 3. 2 0 1 cos lim x x x 4. 0 1 cos lim x x x 5. 2 0 1 cos 5 lim x x x 6. 2 0 1 cos lim 2 tan x x x 7. 3 0 2sin sin 2 lim x x x x 8. 2 0 1 cos lim sin x x x 9. 0 1 cos 4 lim 1 cos 5 x x x 10. 3 0 tan sin lim x x x x 11. 0 1 sin cos lim 1 sin cos x ax ax bx bx 12. 3 0 tan sin lim x ax ax x 13. 3 sin 3 cos lim sin 3 x x x x 14. 4 sin cos lim sin 4 x x x x 15. 2 0 1 cos cos 2 lim x x x x 16. 2 0 cos cos lim sin m n x ax bx cx 17. lim 2 2 2 2 2 n n n dÊu c¨n 18. 4 2 sin 2 lim tan 1 x x x 19. 4 lim 4 tan 2 x x x 20. 6 sin 6 lim 3 cos 2 x x x 21. 2 2 4 lim cos 4 x x x 22. 1 lim(1 ) tan 2 x x x 23. 3 sin 3 lim 1 2cos x x x 24. 3 2 0 3 sin lim 1 cos x x x x x x 25. 3 0 1 cos lim .sin 2 x x x x 26. 2 3 3 0 1 cos lim tan sin x x x x 27. 0 sin sin lim sin x ax bx cx 28. 2 0 cos cos lim sin x ax bx cx 29. 0 1 cos lim 1 cos x ax bx 30. 0 cos 7 cos3 lim cos15 cos11 x x x x x 31. 2 2 0 (1 cos ) lim sin 2 .tan x x x x x 32. 0 1 cos 4 lim .sin x x x x 33. 2 0 2 1 cos lim sin x x x 34. 0 1 sin 1 sin lim tan x x x x 35. 2 0 lim 1 sin cos x x x x x 36. 0 1 3 1 lim sin sin 3 x x x x Bµi tËp chuyªn ®Ò: Giíi h¹n hµm sè Duy Chung - THPT Mª Linh gioi han ham so-Bai tap-2011.doc - 4 - 12/14/2011 37. 2 0 sin( 2 ) 2cot( ) cot lim x a x a x a x 38. 0 3 2sin lim 1 cos x x x x 39. 0 2 1 sin cos 2 lim tan 2 x x x x x 40. 0 9 3 lim sin 7 x x x 41. 2 0 1 sin cos 2 lim sin x x x x x 42. 2 0 sin lim 1 sin cos x x x x x 43. 0 sin 5 lim 3 3 x x x 44. 2 2 0 2sin sin 1 lim 2sin 3sin 1 x x x x x 45. 0 1 cos .cos 2 .cos3 lim 1 cos x x x x x 46. 3 3 tan 3tan lim cos 6 x x x x 47. 3 3 4 1 cot lim 2 cot cot x x x x 48. 3 2 0 1 cos cos 2 . cos 3 lim x x x x x 49. 0 1 |1 sin 3 | lim 1 cos x x x 50. 0 2 lim cot sin 2 x x x 51. 0 2 cos cos 2 lim sin 2 x x x 52. 3 0 tan sin lim x x x x 53. 0 1 sin 2 cos 2 lim 1 sin 2 cos 2 x x x x x 54. 2 2 0 tan( ) tan( ) tan lim x a x a x a x 55. 3 0 1 tan 1 sin lim x x x x 56. 0 1 2 1 sin lim 3 4 2 x x x x x 57. 3 2 2 1 2 lim 1 sin( 1) x x x x x 58. 2 2 0 1 cos lim x x x x 59. 0 1 cos lim 1 cos x x x 60. 2 0 2006 1 cos 3 .cos 5 .cos 7 lim . 2005 sin 7 x x x x x V Giíi h¹n d¹ng: 1 1. 4 3 1 lim 2 x x x x 2. 2 cot 2 0 lim 1 x x x 3. 1 sin 0 1 tan lim 1 sin x x x x 4. 1 1 lim sin cos x x x x 5. 2 1 2 lim 1 x x x x 6. 2 2 2 3 lim 2 x x x x 7. 1 lim 1 sin x x 8. cot 0 1 sin cos lim 1 sin cos x x x ax x bx . Bµi tËp chuyªn ®Ò: Giíi h¹n hµm sè Duy Chung - THPT Mª Linh gioi han ham so- Bai tap-2011.doc - 1 - 12/14/2011 I Giíi h¹n d¹ng 0 0 1. 2 2 3 5 6 lim 8 15 x x x x. 1 81 1 lim x x x x Bµi tËp chuyªn ®Ò: Giíi h¹n hµm sè Duy Chung - THPT Mª Linh gioi han ham so- Bai tap-2011.doc - 2 - 12/14/2011 II Giíi h¹n d¹ng 40. 3 2 4 3 2 2 3 4 1 lim 5. x Bµi tËp chuyªn ®Ò: Giíi h¹n hµm sè Duy Chung - THPT Mª Linh gioi han ham so- Bai tap-2011.doc - 3 - 12/14/2011 V Giíi h¹n lîng gi¸c: cho 0 sin lim 1 x x x