3.875×（1/5）+（38+3/4）×0.09-0.1555÷0.4的巧算
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0.155多了个5吧?
3.875×（1/5）+（38+3/4）×0.09-0.155÷0.4
=3.875×（1/5）+38.75×0.09-0.3875
=3.875×0.2+3.875×0.9-0.3875
=3.875×(0.2+0.9)-0.3875
=3.875×(1+0.1)-0.3875
=3.875+0.3875-0.38875
=3.875+(0.3875-0.38875)
=3.875
3.875×（1/5）+（38+3/4）×0.09-0.155÷0.4
=3.875×（1/5）+38.75×0.09-0.3875
=3.875×0.2+3.875×0.9-0.3875
=3.875×(0.2+0.9)-0.3875
=3.875×(1+0.1)-0.3875
=3.875+0.3875-0.38875
=3.875+(0.3875-0.38875)
=3.875
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