计算:(x)/(x-y)-(y)/(x+y)+(2xy)/(x^2-y^2)
(x^2+xy/x-y)/(xy/x-y)计算
x-y/xy-y^2计算
计算:(x+y/x-y)÷(xy+x^2)
计算(x-y)(x^2+xy+y^2)得
计算:(X+Y)(X^2-XY+Y^2)
因式分解:x×x-xy-2y×y-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)
计算:y/(x的平方-xy)+2/(y-x)-x/(y的平方-xy)
计算:(x^2-y^2/xy)^2/(x+y)^2*(x/x-y)^3
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算(xy-y^2)÷x-y/xy
计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2