5.4/18+12 简算

问题描述:

5.4/18+12 简算

5.4/18+12
=3/10+120/10
=123/10
5.4/(12+18)
=5.4/30
=18/100
=0.18

5.4/18+12
=(0.3×18)/18+12
=0.3+12
=12.3
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