1999+199.9+19.99+1.999=?

分类: 作业答案 • 2021-12-03 11:09:45

问题描述：

答

1999+199.9+19.99+1.999
=1999+1+199.9+0.1+19.99+0.01+1.999+0.001-0.001-0.01-0.1-1
=2000+200+20+2-1.111
=2220.889