(2.5+0.25)乘0.4怎样用简便方法计算
问题描述:
(2.5+0.25)乘0.4怎样用简便方法计算
答
(2.5+0.25)x0.4
=2.5x0.4+0.25x0.4
=1+0.1
=1.1