騎機車時想到的2017數學問題 - 拼圖
By Jessica
at 2017-01-07T00:03
at 2017-01-07T00:03
Table of Contents
難得看到解得出來的題目就來獻醜一下XD
2017*(a+b+c)=a*b*c
因為2017是質數,且a b c最大為2017,所以至少c=2017
=> a+b+2017=ab
=> 2017+1=ab-a-b+1=(a-1)(b-1)=2018
=> 2018=1*2018 => a=2, b=2019>2017 不合
=2*1009 => a=3, b=1010
1009為質數無法再分解,所以 a=3, b=1010, c=2017 為唯一解
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