41.2*8.1+11*1.25+53.7*1.9 如何简便计算?(脱式)

问题描述:

41.2*8.1+11*1.25+53.7*1.9 如何简便计算?(脱式)
*是乘号
1个回答 分类:数学 2014-11-05

问题解答:

我来补答
41.2*8.1+11*1.25+53.7*1.9
=41.2*8.1+11*1.25+(41.2+12.5)*1.9
=41.2*8.1+11*1.25+41.2*1.9+12.5*1.9
=41.2*(8.1+1.9)+1.25(11+19)
=41.2*10+1.25*30
=412+37.5
=449.5
 
 
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