［x（x^2y^2-xy）-y（x^2-x^3y）］÷3x^2-y

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