12345679*81=?

3 years ago

source link: https://yanhaijing.com/math/2014/04/21/12345679mul8/
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12345679*81=? 转编辑

21 April 2014

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原文网址：http://yanhaijing.com/math/2014/04/21/12345679mul8/

12345679*81

=(11111111+1111111+111111+11111+1111+111+11+2)*9*9

=(99999999+9999999+999999+99999+9999+999+99+9+9)*9

=(100000000+10000000+1000000+100000+10000+1000+100+10+10-9)*9

=111111111*9

=999999999

Done.

原文：http://www.cnblogs.com/tupx/archive/2012/04/22/2464906.html

原文网址：http://yanhaijing.com/math/2014/04/21/12345679mul8/