> 数学 >
(m+2n)(m-2n)-2(m-n)的平方
人气:460 ℃ 时间:2020-04-28 05:14:44
解答
答:
(m+2n)(m-2n)-2(m-n)^2
=m^2-(2n)^2-2(m^2-2mn+n^2)
=m^2-4n^2-2m^2+4mn-2n^2
=-m^2+4mn-6n^2
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版