4x^2y^3(2x^2-3xy+5y^2)/(-4x^2y^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^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
已知(x+2)^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
计算4xy+(x-2y)的平方+(x+3y)(3y-x)
已知x,y>0 2x+y+3=xy 求5x+4y最小值
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
因式分解 求过程 x-xy+3y-3x 2x+xy-y-4x+5y-6
x^5+x^4y-2x^3y^2-x^2y^3-xy^4+2y^5
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )