27.8乘0.25+71.2乘5.64+5.64
题目
27.8乘0.25+71.2乘5.64+5.64
简便计算
答案
27.8*0.25+71.2*5.64+5.64
=27.8*0.25+5.64*(71.2+1)
=27.8*0.25+72.2*5.64
=27.8*0.25+72.2*(0.25+5.39)
=27.8*0.25+72.2*0.25+72.2*5.39
=0.25*100+72.2*5.39
=25+389.158
=414.158
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