72乘0.03加0.3乘2.8简便算法怎样算?
问题描述:
72乘0.03加0.3乘2.8简便算法怎样算?
答
72x0.03+0.3x2.8
=0.3x7.2+0.3x2.8
=0.3x(7.2+2.8)
=0.3x10
=3