计算:(1)8x^2y^2*(-3x/4y^5) (2)(x+y)^2/xy-y^2*(y-x)^2/xy+y^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)
(x^2+xy/x-y)/(xy/x-y)计算
x-y/xy-y^2计算
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
计算4xy+(x-2y)的平方+(x+3y)(3y-x)
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
计算:(x+y/x-y)÷(xy+x^2)
x^2y+4xy+4y