chuyên đề hệ phương trình

.      =−+ =++ 0 2 2 yxyx y x yx      −=++ −=+− 222 22 )yx(7yxyx )yx(3yxyx    =+− =+− 1 1 23 2234 xyxyx yxyxx x x y y x y x y 4 2 2 2 2 4 6 9 0 2 22 0   − + − + =  + + − =      +=− +=+ yxxy xyyx 233 233 3)1( 3)1( .67    =++ =+ 3 32 .109 22 24 yyx yxx    =−−− =+−+ 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 31.    =−++− =++−+ 0244 0)12)(1(2 2 2 yxxyx yxxy 34.    ++=+ =+++ 272)( 41 22 22 yxyxy yxyyx      =−++ =+++ 24 527 .43 yxyx yxyx      += =−−+−+ 122 122 .44 33 22 yx yxyxx        = + + = + +++ 1 1 2 13 )( 5 4)(8 .47 2 22 yx x yx xyyx ( ) ( )      +=−++ =++++ 832224 111 .53 2 22 yxx yyxx 57.    −=−++ =+−+ )1(3)1()( 0232 2 22 yyxyxxy xyxyx    =−++ =−+− 0101112835 039222114 .58 22 22 yxyx yxyx      +−=−−+ +=−+++ 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      =−++ −=+−+ 0 123 .64 yxyx yxyx      −−+−=−++ =−+−+ )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    =+−++ =+− 01312632 02 .75 23 222 xyxx yxyx    =++− =++− 02)63( 01)3( .76 22 22 xyxy xyxy    −=+ +=+ 13 122 .77 33 33 xyyx xyyx    =+ =+ xyxy yxyx 10 40 .79 23 23    =++ −=+++ 12 32 .80 22 yxxy xyyyxx ( ) ( )      −= − + =++++ 12 35 1 111 .83 2 22 x y y yyxx      =−+− =−−− 32667 111 .84 xyxy xyyx    =−−++ =−++ 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    =−− =+++ 102)2( 7)(2 .91 22 xxyy yxyx    −+=+− =−++ )9(9 211 .93 342 3 yyxyyx yx    +=+ +=++ 662 922 .97 2 2234 xxyx xyxyxx    =−++ +=− yyxyx yyx 32 12 .99 2    =++ =++ 222 8134 6132 .101 yxyyx yxxy    =++ =++ 222 131 71 .102 yxyyx yxxy    +=++ =+−+− 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      =− −=−+− 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    =++ =−−+− yxx yyxyx 32 28309 .116 2236      + + =+ −=++ 2 1 14 .117 2 22 x y yx yxyyx    −=−+ =+−− yxyxyx yyyxx 23 3)1(2 .121 22 22      =+− −−=+−+− 3 )23(2122 .122 2 24242 xyx yxyxyyx    =−++ =−−− 02 11 .124 22 xyxyxy yxx      =+ =++ 12 7 .125 2 2 x y x yxyxy    +=+ +=+ 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      +−=−+ =+ )13( 25 57 34 5 1 .137 2 22 xyxx yx    =− −=− 3)( 2 .138 322 44 yx yyxx 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 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  − + =     + − + = −   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  − + + = + + −   − + = − +  