Question

9.99+0.999+0.0999+0.00999简便方法怎么算？

Answer 1

可以把9.99看成十减0.01
把0.999看成十减0.001。
把0.0999看成十减0.0001
把0.00999看成十减0.00001
然后用40-后面几个小数的和得出结果。

Answer 2

9.99+0.999+0.0999十0.0999
=10一0.01+1一0.001+0.1一0.0001+0.01一0.00001
=(10十1十0.1十0.01)一(0.01十0.001十0.0001十0.00001)
=11.11一0.01111
二11.09889

Answer 3

9.99+0.999+0.0999+0.00999
=9.99+9.99*0.1+9.99*0.01+9.99*0.001=9.99*（1+0.1+0.01+0.001）
=(10-0.01)*1.111=10*1.111-0.01*1.111=11.11-0.01111=11.09889

Answer 4

原式＝10+1+0.1+0.01-0.01111＝11.11-0.01111＝11.09889

Answer 5

原式=10-0.01+1-0.001
+1-0.0001+1-0.00001
=14-0.01111
=13.98889