=>(100a+10b+c)+(100b+10c+a)+(100c+10a+b)=666
=>(100a+10a+a)+(100b+10b+b)+(100c+10c+c)=666
=>111a+111b+111c=666
=>111.(a+b+c)=666
=>a+b+c=6
Mà a>b>c>0
=>a=3;b=2;c=1
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