8.15-3.78-2.22,4.5+5.87-6.23,64+7.5+2.5,17.75+0.8-9.87,4.76+5.87-2.

分类: 作业答案 • 2021-12-19 11:55:35

问题描述：

答

8.15-3.78-2.22
=8.15-（3.78+2.22）
=8.15-6
=2.15
64+7.5+2.5
=64+（7.5+2.5）
=64+10
=74
4.76+5.87-2.76
=4.76-2.76+5.87
=2+5.87
=7.87