(m+n)()[m-(n+p)]=2m-p括号里填什么符号急啊

问题描述:

(m+n)()[m-(n+p)]=2m-p括号里填什么符号急啊

填 + 号
(m+n)(+)[m-(n+p)]=2m-p
(m+n)(+)[m-(n+p)]
=m+n+m-n-p
=2m-p