4.21-(6.75-2.76)-1.25的简便运算

分类: 作业答案 • 2021-12-20 04:37:12

问题描述：

答

4.21-(6.75-2.76)-1.25
=4.21-6.75+2.76-1.25
=4.21+2.76-6.75-1.25
=（4.21+2.76）-（6.75+1.25）
=6.97-8
=-1.03

答

4.21-(6.75-2.76)-1.25
=4.21+2.76-(6.75+1.25)
=6.97-8
= -1.03