0.79×2.5＋7.9×0.75怎样简便计算

分类: 作业答案 • 2023-01-05 02:40:10

问题描述：

答

0.79×2.5＋7.9×0.75
=0.79*2.5+0.79*10*0.75
=0.79*(2.5+10*0.75)
=0.79*(2.5+7.5)
=0.79*10
=7.9