0.79×2.5＋7.9×0.75怎样简便计算

分类: 作业答案 • 2021-12-19 10:45:56

问题描述：

答

=0.79*2.5+0.79*7.5
=0.79*（2.5+7.5）
=0.7910
=7.9

答

原式=0.79*2.5+0.79*7.5
=0.79*(2.5+7.5)
=0.79*10
=7.9

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