x^3-2x^2*y-4xy-8y-8
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^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
-4x²y-8xy²+2x²y-3xy²
因式分解:3x^2y+6xy-4x-8
因式分解 3x^2-6xy-4x+8y
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
因式分解:8(x-2y)-x(7x+y)+xy.
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
分解因式(x^2+3x+2)(3+8x+4x^2)-90xy(xy+1)+(xy+3)-2(x+y+0.5)-(x+y-
已知2x+xy=10,3y+2xy=6.求4x+8xy+9y=?
先化简再求值(x+y)(x-y)-(4x的立方y-8xy的立方)/2xy,其中x=-1,y=3/根号3