-2x^3y+8x^2y^2-8xy^3
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
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
(x+y)(x-y)-(2xy+3y)平方
(1) -3X^-2XY-8XY-(-5Y^2)-2X^2-Y^2
xy/3x+2y=1/8 xy/2x+3y=1/7
-4x²y-8xy²+2x²y-3xy²
已知1/x+1/y=8,求2x-3xy+2y/x+2xy+y的值
[x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)