Ta có abc + bca + cab =666
\(\Rightarrow100a+10b+c+100b+10c+a+100c+10b+a=666\)
\(\Rightarrow111a+111b+111c=111\left(a+b+c\right)=666\)
\(\Rightarrow a+b+c=6\)
Mà \(a>b>c\Rightarrow a=3;b=2;c=1\)
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