作乘法:(x+y)(x^2-xy+y^2)；(x-y)(x^2+xy+y^2)

作乘法:(x+y)(x^2-xy+y^2)；(x-y)(x^2+xy+y^2) （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 计算,（x^2-xy）/（xy^2）·y/（y-x） 分式的 乘法, (x+y-2xy)(x+y-2)+(1-xy)² (x^2-xy)y÷y-x/xy怎么做? (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*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 因式分解xy+y平方+x-y-2 x^2y+4xy+4y x-y/xy-y^2计算