［x（x^2y^2-xy）-y（x^2-x^3y）］÷3x^2-y
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［x（x^2y^2-xy）-y（x^2-x^3y）］÷3x^2-y［x（x^2y^2-xy）-y（x^2-x^3y）］÷3x^2-y［x（x^2y^2-xy）-y（x^2-x^3y）］÷3x^2-y原
［x（x^2y^2-xy）-y（x^2-x^3y）］÷3x^2-y
［x（x^2y^2-xy）-y（x^2-x^3y）］÷3x^2-y
［x（x^2y^2-xy）-y（x^2-x^3y）］÷3x^2-y
原式
=(x^3y^2-x^2y-x^2y+x^3y^2)÷3x^2-y
=1/3(2x^3y^2-2x^2y)÷x^2-y
=1/3(2xy^2-2y)-y
=2xy^2/3-2y/3-y
=2xy^2/3-5y/3
x根号x+x根号y/xy-y^2)-（x+根号xy+y/x根号x-y根号）y
(xy-x²)÷(x²-2xy+y²/xy)×（x-y/x²）
x-y/x²÷x²-2xy+y²/xy*（xy-x²）
(-x-y)(x^2+xy+y^2)
化简x^-y^/x^-2xy+y^
2*(x-y)²(y-x)(xy)
（x^2+xy/x-y)/（xy/x-y)计算
X-Y/2X+2Y XY/X+Y²
因式分解：x×x-xy-2y×y-x-y
（x-y/x+y）^2÷（y-x/x^2+2xy+y^2)^2
(x+y)/x /(x-(2xy-y^2)/x) 因式分解
代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy
因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y)
(x-y)[(x+y)^2-xy]+(x-y)[(x-y)^2+xy]
计算：3xy[2xy-x（y-2）+x]
.(x+y-2)(x+y-2xy)+(xy-1)^2
2（x+y）等于2xy/（x+y)为什么?
【（x+y）²-（x-y）²】/2xy