问题标题:
(18.6-18.6÷3.1)×0.4的简便计算
问题描述:
(18.6-18.6÷3.1)×0.4的简便计算
高云君回答:
(18.6-18.6÷3.1)×0.4
=(18.6-6)x0.4
=12.6x0.4
=12.5x0.4+0.1x0.4
=5+0.04
=5.04
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(18.6-18.6÷3.1)×0.4的简便计算