HỆ PHƯƠNG TRÌNH 1. −=− =− xyyx xy 22 12 33 22 2. +=− +=− )1(33 28 22 33 yx yyxx 3. −=− +=+ )1(3 )3(3 22 23 xxyy xyxyxx 4. −=+− +=++ xyxyyx xyyxyx 1)1)(( 21 2222 5. =−+ =++ 0 2 2 yxyx y x yx 6. =−− =+− 092 62 2 yxyx y x yx 7. =−+ =++ 1 11 3 22 xy yx xyyxyx 8. =+++ = +++ 32233 41 4 1 1 1 )1( yyxxyyx yy xx 9. =−+ =+− 25))(( 13))(( 22 22 yxyx yxyx 10. −= + ++++ −=−+− 1 42 442 124 2 2 2 2 2 y x yxxyx yx y x 11. =+ −= xyyx xxy 6 )9( 22 333 12. =−++ =+++ yyxx yxyyx )2)(1( 4)(1 2 2 13. =++ +−=+++ 2 22 1 143)1)(1( xxxy xxyxyx Phạm Văn Hoan K61A –Toán-ĐHSP Hà Nội 14. =+− =+− 1 1 23 2234 xyxyx yxyxx 15. −+−+= −+= 1681645 )4)(45( 22 2 yxxyxy xxy 16. +−=+ +−=+ )(21 )(21 23 23 xyyy yxxx 17. =−+− =+ 0)(9)(8 012 33 yxyx xy 18. =+ =− yxyx xyxy 10)( 3)(2 22 22 19. =−−− =+−+ 38923 143 22 22 yxyx yxyx 20. =−++ =+−+− 0222 0964 22 224 yxyx yyxx 21. +−=−+ +−=+ 5223 1222 22 22 yxyxyx xyyyx 22. −=−− =−+ 22 2 1 2 22 2 yxyy y xx 23. −−=−−− −−=−− 3 3 123)123(2 1232232 xxyy xyyx 24. −+=+ + + =+ yxyx yx yx y x x 62)2(2 23 2 3 1 2 25. −=+++ =++ 2 3 )2)(2( 03 2 yyxyx yxy 26. ++=++ =+ 62 2 4 2 42 3 xx y x y x x x y x 27. +−−=+−+ =+−− 2332 06 2233 xyxyx xyyxyx 28. =+−+− =−− 1212 0232 22 xyx yxyx 29. −+=−+ =+− 3232 1 2234 xxyxyxxyx yxyxx 30. =+−+−+ =+−+ 013232 0)2)(12( 22 2 yyxyxx yyx 31. =−++− =++−+ 0244 0)12)(1(2 2 2 yxxyx yxxy 32. =++++ =++++ 11)1( 30)2()1( 22 3223 yyyxyx xyyyxyyx 33. −+=−+ −−=+ 232 262 yxyxx yx y x y 34. ++=+ =+++ 272)( 41 22 22 yxyxy yxyyx 35. =− =− 19 2.)( 33 2 yx yyx 36. += −=− 32 2 2 4 3 yx y y x x 37. =++ =−+++ 8 1 2 33 1 y yx yx y x 38. −=+ =+ 22 333 6 191 xxyy xyx =− =+ 6)2( 8)32( .39 3 3 yx yx −=+++ −=+ 112)1(2 26)1( .40 222224 2 yxyyxyx yyx −=+ =++ xxyx xyxxy 329)3(2 522 .41 22 +=++ +=+ 2 6432 )1(1)2( 22 .42 xyx xxyyx =−++ =+++ 24 527 .43 yxyx yxyx += =−−+−+ 122 122 .44 33 22 yx yxyxx ( ) =+−+− +=+ 402415222012 )3()34(2 .45 2422 xxy xxxyy x −+=+ −−=−− 2433 2 8 )452(6152 .46 232 23 yx y xx y x yxyxyxx = + + = + +++ 1 1 2 13 )( 5 4)(8 .47 2 22 yx x yx xyyx =−+ ++=−+ 2 2233 234 4 45 4)3( .48 xyyx xyyxyyx =+ =−++ 35 2 .49 yx yyxyx =− =−++ 12 12 .50 22 22 yxy yxyx =++− =++− 0263 013 .51 222 222 xyyyx xyyyx −=+ =+ xyyxyx yx )2(54 2 .52 22 ( ) ( ) +=−++ =++++ 832224 111 .53 2 22 yxx yyxx =++ =++++ 12 4)1( .54 22 xyyx yxyyx =++− =−+− 2 0496 .55 3223 yxyx yxyyxx =++− =−++ 222 0)(2 .56 33 yxyx yxxyyx 57. −=−++ =+−+ )1(3)1()( 0232 2 22 yyxyxxy xyxyx =−++ =−+− 0101112835 039222114 .58 22 22 yxyx yxyx −=−+−− +=+ 214122 22 .59 3 32 223 xyyx xyyxyx +−=−−+ +=−+++ 3 23 2 23353 2332 .60 xxyyy xyyyx ( ) +=++ −+=−− xxyyx yxyx 2 3 22 2820)12)(2( .61 =+++ ++++=+ xyyx xyxyxyx 8483 47)(7 .62 22 223 +=++ +=+ xyyx xyyx 10214 252 .63 22 =−++ −=+−+ 0 123 .64 yxyx yxyx =+ =+ 22 333 64 18278 .65 yxyx yyx +−=− −+=+++ yx y x y yxyxyx 332 633 .66 +=− +=+ yxxy xyyx 233 233 3)1( 3)1( .67 −−+−=−++ =−+−+ )221()(11 )21(23 .68 22422 422242 xyxxxyx yxxyxyx ++=+ −+=+−+− xyxxy yyxxyxxx 2443 13)3(1 .69 22 −+=− −=−−+ xyx yxyxyx 3216 4 .70 2 =++−+ +−=− 41)24()24( 29 .71 yyyxx yxyx =+−+ =−++ 0152 05 .72 2 22 yyxy yxxyyx −=− +−=− xyyx xyyx 22 3222 .73 33 2222 =+−+ =−−−− 81 5)121(1 .74 2 xxyy xyx =+−++ =+− 01312632 02 .75 23 222 xyxx yxyx =++− =++− 02)63( 01)3( .76 22 22 xyxy xyxy −=+ +=+ 13 122 .77 33 33 xyyx xyyx =+−+ =+−+ 222 16)3( 43 .78 yxyxy yxyxy =+ =+ xyxy yxyx 10 40 .79 23 23 =++ −=+++ 12 32 .80 22 yxxy xyyyxx =−++ −= + − 1121 22 2 .81 3 2 2 2 xy x x y xy =−−− =−− 1121 02 .82 yx xyyx ( ) ( ) −= − + =++++ 12 35 1 111 .83 2 22 x y y yyxx =−+− =−−− 32667 111 .84 xyxy xyyx =+++ =++++ 52 5 .85 242 322 xyxyyx xyxyyxyx =−−++ =−++ 01344 072 .86 223 2 yxxyyxy yxxyy −=+ =+++ 3 12444 .87 22 xyy yxyx =+− =+−−+− 4 06242)3( .88 34 xyxyy yyxyxyy =+++ =−+−− 2321 012 .89 2 yx yxxyy ( ) =−−−+ =−−+++ 12248 02)3(12)22( .90 yyx yyxx =−− =+++ 102)2( 7)(2 .91 22 xxyy yxyx =− =+ 6)2( 8)32( .92 3 3 yx yx −+=+− =−++ )9(9 211 .93 342 3 yyxyyx yx =+++ +=+ 6854 .94 2 61045 yx yyxyx =+ =+ 222 22 51 6 .95 xyx xxyy −=−− −=++ yxxyyx yxyxxy 2212 2 .96 22 +=+ +=++ 662 922 .97 2 2234 xxyx xyxyxx −=+++ −=++++ 4 5 )21( 4 5 .98 24 232 xxyyx xyxyyxyx =−++ +=− yyxyx yyx 32 12 .99 2 =+−+ =−++ 01 5 )( 03)1( .100 2 2 x yx yxx =++ =++ 222 8134 6132 .101 yxyyx yxxy =++ =++ 222 131 71 .102 yxyyx yxxy =−++ =−−++ 74324 025)3()14( .103 22 2 xyx yyxx +=++ =+−+− 222 322 )(2)( 0)(2345 .104 yxyxxy yxyxyyx =−−−+ =−++ 0542 01532 .105 224 22 yxyx yxyx −=− +=+ 22 22 2 11 )(2 2 11 .106 xy yx yx yx +=+− +−+=− 33)2( )5)(2011(32 .107 2 xxyy yyyx +≥+ +−+=+− 2 3232 2 1 2 )4)(62(566 .108 xx x xxxxxx =++ =+ 3 32 .109 22 24 yyx yxx =− −=−+− 369 )(3 .110 22 22 yx yxyxyxyx =++− +=++ 21 222 .111 22 xyxy xyyxyx = −+=−+ 1 452 .112 xy yxyyxx + − =+ =−+− yx xy yx xyyx 21 2 1 11 .113 22 =−− −=+−+ 12)4)(4( 7)(4 .114 22 yxxy yxyx = − = + 32 1 1 3 2 .115 3 3 y x y x =++ =−−+− yxx yyxyx 32 28309 .116 2236 + + =+ −=++ 2 1 14 .117 2 22 x y yx yxyyx =++++ − =+++ 423)2)(( 2 )( 1212 .118 2 yxyxyx yx yx =−− =−+− 2012)4024(2010 1)201320122011)(2010( .119 3 3 yx yx =+ =+−++ 3032 06)32(536188 .120 22 22 yx xyyxxyyx −=−+ =+−− yxyx yx yyyxx 23 3)1(2 .121 22 22 =+− −−=+−+− 3 )23(2122 .122 2 24242 xyx yxyxyyx =+ =+ xyyx yyx 69 8727 .123 22 333 =−++ =−−− 02 11 .124 22 xyxyxy yxx =+ =++ 12 7 .125 2 2 x y x yxyxy ( ) +=−+ +=+ 3311 2 21 .126 22 xxy y x x y x +=+ +=+ xxy yxxyyx 9267 9432 .127 2 22 =−++ −−=+ 416 2322 .128 3 yx yxyx =+−−++ =+−+− 01467 18)432)(432( .129 22 22 yxxyyx yyxx =+++ −−=+++ 64224 2)32(12)12(2 .130 3 yx yyxx =− ++=++ 7)( 99 .131 33 22334 xyx xyxxyyyxx ++−= −−=−+ xxyxy yxxxy 1212 13122 .132 2 3 −=+ =− yxyx yx 9432 35 .133 22 33 −−=−− +++=+ 121 243 .134 2 233 yyx xxxyy =−−+ =−+ 0282 148 .135 44 233 yxyx xyyx −+=++ +=+ 3 2244 12221011 )133(28137 .136 yxxyxy yyxyx +−=−+ =+ )13( 25 57 34 5 1 .137 2 22 xyxx yx =− −=− 3)( 2 .138 322 44 yx yyxx =−+ =+ −+ 1 2 1 2 1 3 .139 22 22 y x yx x y yx =−−+ −+−≥−+− 01714 )2(2)1(212 .140 2 2 xxy yxxxyx 141. 2 3 2 4 5 2 2 5 0 x y x y y x y x − + + = − + = 142. 3 3 1 1 ( 4 )(2 4) 36 x y x y x y x y − = − − − + =− 143. −=−+ −=− 1724 11716 222 yxxy yyx 144. 3 2 1 0 (3 ) 2 2 2 1 0 x y x x y y − + = − − − − = 145. ( ) 2 2 2 3 3 3 x y x x y x y x x + + + = − + + = + 146. ( ) 3 2 2 7 2 2 2 4 x y y x x − + = + − + = − 147. 2 2 8 2 2 3 2 x y y x x y y + = + + − + = − 148. 2 3 2 3 3 16 16 4 2 . 2 3 3 3 12 4 0 x y y x x y x x x y + = − + − + + − − = 149. ( ) 2 2 1 1 2 2 1 8 2 1 2 13 x y x y y x x − − + − = − + − + = 150. 3 3 2 2 2 1 2 1 2 2 2 3 3 y x x x x y x y xy x y − + + = + + − − + = − + 151. ( ) ( ) 2 2 2 1 2 2 2 1 2 1 0 x y x x y x x y x + + + ≥ + + + + − + =