简便方法计算:14.5+6.65*39.9+25.4+2.35*39.9
问题描述:
简便方法计算:14.5+6.65*39.9+25.4+2.35*39.9
答
14.5+25.4+(2.35+6.65)*39.9
=39.9+9*39.9
=39.9*(1+9)
=399