8.7×2.5+0.87×7.5简便计算

分类: 作业答案 • 2023-01-19 18:10:10

问题描述：

答

8.7×2.5+0.87×7.5
=8.7×2.5+2.61×2.5
=(8.7+2.61)×2.5
=11.31X2.5X4/4
=113.1/4
=28.275