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)3(2)2132()83(3232aaaaaa4a)45(2)45(332xxxx2x)3123()31(22122yxyxx2x32y22221313()43223abababcacacabc1a3b1ca=3b=4c=17222278[(2)]abcacbbcaababc2233[22()]2xyxyxyxyxyx=3y=13A2532xx3422xxA22(25)2(35)aaaaa=12222115()(3),,23ababababab2212(34)3(4)3,3xyxxyxxy.23a1325aa=222212()[3()2]2xyxxxyyxyx=2y=1222(341)3(23)1xxxxxx=532x[7x4x322x]x=22x+5x+4+5x4+22xx=23x1x5x=232x+1+23xx=132aab+75ab42a+7a=2b=132111(428)(1),422xxxx152a+2a+1438a+22a+32aa13a222232(33)(53),35xxxx22xy+x2y22xyx2x2y2yx=2y=2.4xy[22x+xy22y32x2xy+y2]11,22xy22x+2x+3xy+22y2xxy+22yx=12y=3532xyx2yx2y+32xyx=-12y=222223()3xxxxx=-1252x32y32x2y2yx=5y=322x5xy32x2y+2x32yx=313y2x+5xx34xx=123)2(3)(2222yxxyyxx223(2)[322()]xxyxyxyy,1,32xy33222312222ababababba=1b=132222()3(2)32xxyyxxy223(2)[322()]xxyxyxyy,1,32xy3()2()2xyxy1x3.4y22113122323xxyxyx=2y=2322x+(2x+3xy+22y)(2xxy+22y),x=12y=3.(5a+22a3+43a)(a+43a+22a)a1211(428)(1)42aaa12a1,32xy223(2)[322()]xxyxyxyy2223(21)2(3)xxxxx3x2212216223xxxx53x.2222532ababaababba1a2b4ba2(22ab5ba2)2(3ba22ab),a=1,b=322x2+(-x2+3xy+2y2)-2(0.5x2-21xy+y2),x=21,y=3.A=2x3+3x2-x,B=4x3+8x2-2x+6,x=21A-21B(5a23b2)[(a2b2)(5a23b2)]a1b122312331221yxyxxx=2y=3233222312222ababababba=1b=31424232222abbaabba1a2b4423232222yxyx1x212y342522xxxx2x222232ababbaababba1a2baaaaa64254452222a2222222(23)2(2)xyyxyx1,2xy22131122233mmnmn22,3mn3x5x2xy28x3xy2x=4y=32]6)(23[2122222yxyx2,1yx)2(3)2(4)2(2)2(522babababa+++++21=a9=b