\(\overline{abc}\cdot126=15\overline{abc}\\ 126\cdot\overline{abc}=15000+\overline{abc}\\ =125\cdot\overline{abc}=15000\\ \overline{abc}=120\)
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b,
\(\overline{ab}\cdot\overline{aba}=\overline{abab}\\ \overline{aba}=\overline{abab}:\overline{ab}\\ \overline{aba}=101\)
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