6.9×2.99－6.8×0.99用简便方法怎么做?

分类: 作业答案 • 2022-01-09 18:05:57

问题描述：

答

6.9×2.99－6.8×0.99
=6.8×2.99+0.1×2.99-6.8×0.99
=6.8×（2.99-0.99）+0.299
=6.8×2+0.299
=13.6+0.299
=13.899