计算 :(2x-5y+3)(2x+5y-3) (x-2y)(x-3y)-(3x-2y)^2
计算(x+y)(x+y)^2(-x-y)^3
计算:(-x-2y) * (3x-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)+【-
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
数学(x-y)^5*(y-x)^3*(x-y)^2
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(2X-3y)-(5x-y)
计算:(3x-y)2-(2x+y)2+5x(y-x)
计算2x/x^2-y^2 3x/y^2-x^2 y/(x y)(y-x)快!
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
计算【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2
[(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x)