9+19.9+199.9+1999.9+19999.9 的简便计算

分类: 作业答案 • 2021-12-20 05:33:29

问题描述：

答

10+20+200+2000+20000
-1-0.1-0.1-0.1-0.1
=22230-1.4
=22228.6

答

9+19.9+199.9+1999.9+19999.9
=10-1+20-0.1+200-0.1+2000-0.1+20000-0.1
=10+20+200+2000+20000-1-0.1-0.1-0.1-0.1
=22230-1.4
=22228.6