(28.7-18.6➗3.1)x0.8用简便方法计算
问题描述:
(28.7-18.6➗3.1)x0.8用简便方法计算
答
(28.7-18.6÷3.1)×0.8
=(28.7-6)×0.8
=22.7×0.8
=18.16(28.7-18.6÷3.1)×0.8
=(28.7-6)×0.8
=22.7×(1-0.2)
=22.7-4.54
=18.16