化简:(X^2+XY+Y^2)^2-4XY(X^2+Y^2)
(xy-x^2)乘以(xy)/(x-y)
(x^2+xy/x-y)/(xy/x-y)计算
x^2y+4xy+4y
(-3x^y+2xy)-( )=4x^+xy
(x+y-2xy)(x+y-2)+(1-xy)²
(x^2-xy)y÷y-x/xy怎么做?
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
已知x-y=4xy,则2x+3xy-2yx-2xy-y
计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2