41.2*8.1+11*1.25+53.7*1.9
=41.2*(10-1.9)+11*1.25+53.7*1.9
=41.2*10-41.2*1.9+53.7*1.9+11*1.25
=412+12.5*1.9+1.1*12.5
=412+12.5*(1.9+1.1)
=412+12.5*3
=412+37.5
=449.5
小数的巧算41.2*8.1+11*1.25+53.7*1.9的计算过程
小数的巧算41.2*8.1+11*1.25+53.7*1.9的计算过程
十万火急
十万火急
数学人气:125 ℃时间:2019-09-18 01:46:50
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