61.3乘0.15+15乘1.387怎样简便计算

问题描述:

61.3乘0.15+15乘1.387怎样简便计算

61.3乘0.15+15乘1.387
=0.613*15+15*1.387
=15*(0.613+1.387)
=15*2
=30