谁帮我化简：[(x+y)(x-y)-(x+y)^2-2y(x-y)-2xy]÷xy

谁帮我化简：[(x+y)(x-y)-(x+y)^2-2y(x-y)-2xy]÷xy (x^2-xy)y÷y-x/xy怎么做? （xy-x^2)乘以(xy)/(x-y) （x^2+xy/x-y)/（xy/x-y)计算 因式分解：x×x-xy-2y×y-x-y 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 计算：(x+y/x-y)÷(xy+x^2) 化简求值：x-y/x²-2xy+y²-xy+y²/x²-y²,其中(x 作乘法:(x+y)(x^2-xy+y^2)；(x-y)(x^2+xy+y^2) x-y/x²÷x²-2xy+y²/xy*（xy-x²） (x+y-2xy)(x+y-2)+(1-xy)² 计算（xy-y^2)÷x-y/xy