7.8乘2.5,加78乘0.75用简便计算怎么算?
问题描述:
7.8乘2.5,加78乘0.75用简便计算怎么算?
答
7.8*2.5+78*0.75
=7.8*2.5+7.8*2.5
=2(7.8*2.5)
=15.6*5
=78