化简：x^2-2xy+y^2/y^2-x^2

化简x^-y^/x^-2xy+y^ x^2y-2xy+y化简 (-x-y)(x^2+xy+y^2) 2*(x-y)²(y-x)(xy) 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) （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 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 化简(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y) 化简2(x²y+xy)-3(x²y-xy)-4x²y 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+y-2)(x+y-2xy)+(xy-1)^2 (x^2-xy)y÷y-x/xy怎么做? 代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy (x+y)/x /(x-(2xy-y^2)/x) 因式分解 [(x-y)^2-(x+y)^2]/(-4xy) 化简