简便方法计算18.36-2.25+1.64-4.75=还有5.36-2.78-2.36全部简便方法计算!

分类: 作业答案 • 2021-12-19 11:39:39

问题描述：

简便方法计算18.36-2.25+1.64-4.75=
还有
5.36-2.78-2.36
全部简便方法计算!

答

18.36-2.25+1.64-4.75
=18.36+1.64-(2.25+4.75)
=20-7
=13
5.36-2.78-2.36
=5.36-2.36-2.78
=3-2.78
=0.22