> 数学 >
2m-{n+[4m-3(m+2n)]}-5n其中m=2/3 n=-4
人气:316 ℃ 时间:2020-06-16 15:03:04
解答
2m-{n+[4m-3(m+2n)]}-5n
=2m-{n+[4m-3m-6n]}-5n
=2m-{n+[m-6n]}-5n
=2m-{m-5n}-5n
=2m-m+5n-5n
=m
=2/3
推荐
猜你喜欢
© 2026 79432.Com All Rights Reserved.
电脑版|手机版