12.5+7.9*1.25简便运算
问题描述:
12.5+7.9*1.25简便运算
答
=12.5 + (8 - 0.1) * 1.25
=12.5 + 8 * 1.25 - 0.1 * 1.25
=12.5 + 10 - 0.125
=22.5 - 0.125
=22.375