> 数学 >
若m=x^3-3x^2y+2xy^2+3y^3,n=x^3-2x^2y+xy^2-5y^3,则2x^3-7x^y+5xy^2+14y^3的值是
答好加赏
人气：427 ℃　时间：2019-10-17 14:33:28
解答
2x^3-7x^y+5xy^2+14y^3=3(x^3-3x^2y+2xy^2+3y^3)-(x^3-2x^2y+xy^2-5y^3)
=3m-n
推荐
猜你喜欢
© 2026 79432.Com All Rights Reserved.
电脑版|手机版