(2x-y)(2x+y)=-5/2(2y^2-64/5) 求(x-y)² 2x(y-1)+4(1/2x-1)=0 求x^4+y^4-2x²y²七下第一章整式的运算测试题

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) y+y'-2y=2x 微分方程y - 2y' + y = x 2(x-y)=5y,x-y=-5 化简y(x+y)+(x+y)(x-y)-x^2 x-y / 5y= (y-x)^2 / ( ) x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 x*x+2x+y*y-4y+5=0 x= y= 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 求(X+Y)(X-Y)(X²+Y²),X=5 Y=2, 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)