\(\overline{ab}.\overline{cc}.\overline{abc}=\overline{abcabc}\) (\(a,b,c\in N;0< a\le9;0\le b\le9\))
\(\Leftrightarrow10a+b+11c+100a+10b+c=100100a+10010b+1001c\)
\(\Leftrightarrow110a+11b+12c-100100a-10010b-1001c\)
\(\Leftrightarrow-99990a-9999b-989c=0\)
Vì \(0< a\le9\) và \(0\le b,c\le9\)
\(\Rightarrow\left\{{}\begin{matrix}-99990a< 0\\-9999b\le0\\-989c\le0\end{matrix}\right.\)
\(\Rightarrow-99990a-999b-989c< 0\)
\(\Rightarrow\left(a;b;c\right)\in\varnothing\)
Vậy không có a,b,c thỏa mãn.
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