计算:(4x^2-y^2)÷4x^2-4xy y^2/2x-y
计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2
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:(x+y/x-y)÷(xy+x^2)
(x^2+xy/x-y)/(xy/x-y)计算
计算:(x-2y)(1+x+2y+4y^2+2xy+x^2)
计算4xy+(x-2y)的平方+(x+3y)(3y-x)
计算[4/(x^2-y^2)+(x+y)/(xy^2-x^2y)]除[(x+2y)(x-y)/(x^2+2xy^2)
x^2y+4xy+4y
x-y/xy-y^2计算
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
计算x²y³-2x(4xy³)
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?