Lê Anh Duy
15/04/2018 at 10:08-
¤« 16/04/2018 at 14:03m.n=(999...99).(888...88)
2015 2015
=(888...88).(1000...00−1)
2015 2016
=(888...88000..00)−(888...88)
4030 2015
=888...887111...112
2014 2014
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FC Alan Walker 16/04/2018 at 13:06\(m.n=\left(999...99\right).\left(888...88\right)\)
2015 2015
\(=\left(888...88\right).\left(1000...00-1\right)\)
2015 2016
\(=\left(888...88000..00\right)-\left(888...88\right)\)
4030 2015
\(=888...887111...112\)
2014 2014
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FC Alan Walker 18/04/2018 at 12:30
The sum of the digits of m.n is: 8.2014+7+1.2014+2=18135.
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Lê Anh Duy 16/04/2018 at 15:05
Find the sum of the digits?