[(1/9(x+y)^3-2(x+y)^2-2/3(x+y)]÷x+y/3
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
【x-3y][x+y]-[x-2y][x +2y]-[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)+【-
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
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(x+y)(x+y)^2(-x-y)^3
数学(x-y)^5*(y-x)^3*(x-y)^2
[(x+2y)^2 -(x+y)(3x-y)-5y^2]÷2x
[(2x+y)(x-3y)+y(x+3y)]÷(2x)计算,
计算:(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2