计算:(3xy)^2*(x^2-y^2)-(4x^2y^2)÷8y^2+9x^2y^4
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:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2
(x^2+xy/x-y)/(xy/x-y)计算
计算:(x+y/x-y)÷(xy+x^2)
x-y/xy-y^2计算
计算4xy+(x-2y)的平方+(x+3y)(3y-x)
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)+2x^4y^2÷(xy)^2
计算(xy-y^2)÷x-y/xy
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
x^2y+4xy+4y