(18.6-18.6÷3.1)×0.4的简便计算
1个回答
(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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