化简-3n+5m-[m-5(m-n)+m]
问题描述:
化简-3n+5m-[m-5(m-n)+m]
答
-3n+5m-[m-5(m-n)+m]
=-3n+5m-[m-5m+5n+m]
=-3n+5m-[-3m+5n]
=-3n+5m+3m-5n
=8m-8n