题目
用简便方法计算下面各题
①4×3.75×0.25
②0.95×21＋0.5×2.1
③（10＋0.1＋0.01）×86
①4×3.75×0.25
②0.95×21＋0.5×2.1
③（10＋0.1＋0.01）×86
提问时间：2021-03-31
答案
①4×3.75×0.25
=4×0.25×3.75
=1×3.75
=3.75
②0.95×21＋0.5×2.1
= 9.5x2.1+0.5x2.1
=2.1x(9.5+0.5)
=2.1x10
=21
③（10＋0.1＋0.01）×86
= 10x86+0.1x86+0.01x86
=860+8.6+0.86
=869.46
=4×0.25×3.75
=1×3.75
=3.75
②0.95×21＋0.5×2.1
= 9.5x2.1+0.5x2.1
=2.1x(9.5+0.5)
=2.1x10
=21
③（10＋0.1＋0.01）×86
= 10x86+0.1x86+0.01x86
=860+8.6+0.86
=869.46
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