15.5*8.2-0.72 用递等式计算

分类: 作业答案 • 2022-02-14 14:02:41

问题描述：

答

15.5*8.2-0.72
=15.5*8+15.5*0.2-0.72
=124+3.1-0.72
=127.1-0.72
=126.38

答

15.5*8.2-0.72
=(15+0.5)(8+0.2)-0.72
=120+4+3+0.01-0.72
=126.29

答

15.5*8.2-0.72
=127.1-0.72
=126.38