12.3乘以0.99 巧算

分类: 作业答案 • 2022-02-10 10:37:32

问题描述：

12.3乘以0.99 巧算

答

=12.3×(1-0.01)
=12.3×1-12.3×0.01
=12.3-0.123
=12.177