百度作业网有这样一道题:"计算(x^3+3x^2y-4xy^2)-(2x^3-x^2y-xy^2)+(x^3-4x^2y+3xy^
有这样一道题,计算(2x立方-3x平方y-2xy平方)-(X立方-2XY立方)+(-X立方+3XY-Y立方)
有这样一道题:"计算(x^3+3x^2y-4xy^2)-(2x^3-x^2y-xy^2)+(x^3-4x^2y+3xy^
计算3xy[2xy-x(y-2)+x-1]
计算：3xy[2xy-x（y-2）+x]
（-3x^y+2xy)-( )=4x^+xy
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
计算 2xy[4x²y²-3y（xy+x²y）-xy²]
已知x-y=4xy，则2x+3xy-2yx-2xy-y
计算4xy+（x-2y）的平方+(x+3y)(3y-x)
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)
计算：(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3