一:(-2x^2y^3)+(8x^2)^2*(-x)^2*9-y)^3;快!
计算2x/x^2-y^2 3x/y^2-x^2 y/(x y)(y-x)快!
已知x-y/x+y=2,求代数式2(x-y)/x+y + x+y/3(x-y)的值 快啊.
有这样一道题:"计算(2*x*x*x-3*x*x*y-2*x*y*y)-(x*x*x-2*x*y*y+y*y*y)+【-
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解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
【x-3y][x+y]-[x-2y][x +2y]-[x-y
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
x-5y=8 2x-3y=9二元一次方程 快呀
3x^2+xy-2y,快
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
求解;一 (x-8y)(x-y) 二 (Y+2)(Y-2)-(Y-1)(Y+5) 三 (3X+4)(3X-4)-(2X+