(2x－3y)(2x+4y)－(3x+2y)(3x-2y)

(x+3y-4)(2x-y) x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2 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) 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)+【- (2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) 计算(x+y)(x+y)^2(-x-y)^3 数学(x-y)^5*(y-x)^3*(x-y)^2 已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 计算【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2