计算:(1)x^2-4y^2/x^2+2xy+y^2除以x+2y/x^2+xy(2)x+2y/x^2-y^2+y/y^2
(x^2+xy/x-y)/(xy/x-y)计算
x-y/xy-y^2计算
因式分解:x×x-xy-2y×y-x-y
计算:(x+y/x-y)÷(xy+x^2)
x^2y+4xy+4y
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)
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-2xy)(x+y-2)+(1-xy)²
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y