\(a)\) \(\overline {aaa} :a =(a.100+a.10+a):a\)\(=(100+10+1).a:a=111.1= 111\)
\(b)\) \(\overline {abab} :\overline {ab} =(\overline {ab}.100+\overline {ab}):\overline {ab}\)\(=(100+1).\overline {ab}:\overline {ab} \)\(= 101.1=101\)
\(c)\) \(\overline {abcabc} :\overline {abc} \)\(=(\overline {abc}.1000+\overline {abc}):\overline {abc}\)\(=(1000+1).\overline {abc}:\overline {abc}\)\(=1001.1= 1001\)
