3.9*2+3.9/0.125的简便运算
问题描述：
3.9*2+3.9/0.125的简便运算
答
3.9*2+3.9/0.125
=3.9*2+3.9/(1/8)
=3.9*2+3.9*8
=3.9*(2+8)
=3.9*10
=39