(-5xy)^2(-xy)^3+(4x^2y-3x)(-x^3y^4)+x^5y^5
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
[-(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)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
因式分解 求过程 x-xy+3y-3x 2x+xy-y-4x+5y-6
5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简
已知x,y>0 2x+y+3=xy 求5x+4y最小值
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
(4x^2y-5xy^2)-(3x^3y-4xy^2)
5xy平方-2x平方y+[3xy平方-(4xy-2x平方y-2x平方y)],其中x=-2,y=-1求值
已知(x+2)^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy