. =−+ =++ 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 − + + = + + − − + = − +