(0.75乘42.6减0.574乘25加57.4)除以3简便方法计算
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解答:
(0.75*42.6-0.574*25+57.4)/3
=[(1-0.25)*42.6-57.4/100*25+57.4]/3
=[(1-0.25)*42.6-57.4(1/100*25-1)]/3
=[(1-0.25)*42.6-57.4*(0.25-1)]/3
=[(1-0.25)*42.6+57.4*(1-0.25)]/3
=[(1-0.25)*(42.6+57.4)]/3
=[(1-0.25)*100]/3
=[0.75*100]/3
=0.75/3*100
=0.25*100
=25
(0.75*42.6-0.574*25+57.4)/3
=[(1-0.25)*42.6-57.4/100*25+57.4]/3
=[(1-0.25)*42.6-57.4(1/100*25-1)]/3
=[(1-0.25)*42.6-57.4*(0.25-1)]/3
=[(1-0.25)*42.6+57.4*(1-0.25)]/3
=[(1-0.25)*(42.6+57.4)]/3
=[(1-0.25)*100]/3
=[0.75*100]/3
=0.75/3*100
=0.25*100
=25
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