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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  + + + ≥ + + +    + − + = 