计算:(x^2y-4y)÷(xy-2y)=___
计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2
计算(xy-y^2)÷x-y/xy
计算:(x+y/x-y)÷(xy+x^2)
x-y/xy-y^2计算
(x^2+xy/x-y)/(xy/x-y)计算
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(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)
设实数x,y满足x²+1/2y²4-xy+2y=0.则x=___,y=___
计算 (-4/3xy)(-3x^2y)^2=( )
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 2xy[4x²y²-3y(xy+x²y)-xy²]