化简下面式子
问题描述：
化简下面式子
8.6×a－3.6×a＋7.5×b×4－(7.5＋c)－3.7
7.7b－1.01a＋30.3b－8.79a
答
8.6×a－3.6×a＋7.5×b×4－(7.5＋c)－3.7
=5a+30b-7.5-c-3.7=5a+30b-c-11.2
7.7b－1.01a＋30.3b－8.79a
=38b-9.8b