化简:x^2-2xy+y^2/y^2-x^2
(xy-x^2)乘以(xy)/(x-y)
(x^2+xy/x-y)/(xy/x-y)计算
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
因式分解:x×x-xy-2y×y-x-y
化简(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y)
作乘法:(x+y)(x^2-xy+y^2);(x-y)(x^2+xy+y^2)
(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)
化简:[(x+y)²-(x-y)²]÷2xy
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