0.9×9.9×99.9×999.9得

问题描述:

0.9×9.9×99.9×999.9得
0.9×9.9×99.9×999.9=
我当然会用,不过要求用简便算法,要不然我问什吗啊
1个回答 分类:数学 2014-12-01

问题解答:

我来补答
0.9×9.9×99.9×999.9
=0.9×(10-0.1)×(100-0.1)×(1000-0.1)
=(9-0.9)×(100-0.1)×(1000-0.1)
=8.1×(100-0.1)×(1000-0.1)
=(810-0.81)×(1000-0.1)
=809.19×(1000-0.1)
=809190-80.919
=809109.081
 
 
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