(x-y/x+y)^2÷(y-x/x^2+2xy+y^2)^2
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
因式分解:x×x-xy-2y×y-x-y
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
计算:(x+y/x-y)÷(xy+x^2)
(x^2-xy)y÷y-x/xy怎么做?
(x^2+xy/x-y)/(xy/x-y)计算
作乘法:(x+y)(x^2-xy+y^2);(x-y)(x^2+xy+y^2)
谁帮我化简:[(x+y)(x-y)-(x+y)^2-2y(x-y)-2xy]÷xy
[x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y
(xy-x^2)乘以(xy)/(x-y)
2xy/(x+y)(x+y)与x/(x+y)(x-y)怎么通分