(X^3-2y^3-3X^3y)-(3X^3-3y^3-7X^2y)怎么化简_数学解答

(X^3-2y^3-3X^3y)-(3X^3-3y^3-7X^2y)怎么化简

人气：309 ℃　时间：2019-08-19 12:00:02

解答

(X^3-2y^3-3X^3y)-(3X^3-3y^3-7X^2y)
=X^3-2y^3-3X^3y-3X^3+3y^3+7X^2y
=-2X^3+y^2+4X^3y+7X^2y