计算7.6×199.9+4.3×199.9-19×19.99

分类: 作业答案 • 2022-01-16 14:24:15

问题描述：

答

7.6×199.9+4.3×199.9-19×19.99
=7.6×199.9+4.3×199.9-1.9×199.9
=(7.6+4.3-1.9)×199.9
=10×199.9
=1999