简便方法计算：41.2*8.1+11*1.25+53.7*1.9怎么算呢?
问题描述：
简便方法计算：41.2*8.1+11*1.25+53.7*1.9怎么算呢?
答
=41.2*8.1+11*1.25+41.2*1.9+12.5*1.9
=41.2*(8.1+1.9)+11*1.25+1.25*19
=41.2*10+1.25*(11+19)
=412+1.25*30=412+37.5=449.5