(7225-104乘15)/55简便方法怎么做
问题描述:
(7225-104乘15)/55简便方法怎么做
答
(7225-104×15)/55……把7225分解成(1451×5),15分解成(3×5)
=(1445×5-104×3×5)/55
=(1445-312)×5/55
=1133/11
=103