2x^2-xy-y^2+13x+8y-7的因式分解

因式分解:8(x-2y)-x(7x+y)+xy. 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) (-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 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] X-Y/2X+2Y XY/X+Y² 因式分解：x×x-xy-2y×y-x-y 3(x-y)²-7(x-y)+8(x-y)²+6(x-y)求详细过程（2） 5xy-4x²y-8xy²+3xy-xy²+4x²y 解方程组x+y+xy=7 x^2+y^2+xy=13 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] x^2+xy-6y^2+x+13y-6 因式分解：x^2-xy-2y^2+x+7y x^2-xy-2y^2+x+7y-6 .(x+y-2)(x+y-2xy)+(xy-1)^2