（1）(x-y/xˇ2-2xy+yˇ2-xy+yˇ2/xˇ2-yˇ2)*xy/y-1（2）m－⒖／mˇ2－9－2／m－3（3）xˇ2－4x／xˇ2－1＋1＝2x／x＋1　ˇ2是二次方

.(x+y-2)(x+y-2xy)+(xy-1)^2 1.（xy-1）^2-(x+y-2xy)(2-x-y)2.(x+y)(x+y+2xy)+(xy-1)(xy+1) （x+y）(x-1)-xy-y^2 怎么因式分解? (x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1) x根号x+x根号y/xy-y^2)-（x+根号xy+y/x根号x-y根号）y x²-y²+5x+3y+4（x+y-2xy)(x+y-z)+(xy-1）² 分解因式：(X+Y）*（X+Y+2XY）+（XY+1）*（XY-1） (x²-4y²)÷(2x+y)/xy×1/x(2y-x）(2x+y)/xy 1/x(2y-x） 都是一项 (xy-x²)÷(x²-2xy+y²/xy)×（x-y/x²） x-y/x²÷x²-2xy+y²/xy*（xy-x²） 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) {(x-y/x^2-2xy+y^2)-(xy+y^2/x^2-y^2)}*(xy/y-1) (-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^2（X+1）-Y（XY+X）因式分解 (x/x+y-x/y-x-2xy/x.x-y.y)/(1/x-1/y) 分式化简