简便方法,3.12×0.99＋31.2×0.001

分类: 作业答案 • 2022-01-09 18:03:21

问题描述：

答

3.12×0.99＋31.2×0.001
=3.12×0.99＋3.12×0.01
=3.12×(0.99+0.01)
=3.12×1
=3.12