Question

0.9+0.99+0.999简便计算

Answer 1

0.9+0.99+0.999
=(1-0.1)+(1-0.01)+(1-0.001)
=3-0.1-0.01-0.001
=3-(0.1+0.01+0.001)
=3-0.111
=2.889
够详细了,应该能看懂吧!