Question

Cm: ababab chia hết cho 7

Answer 1

Ta có: \(\overline{ababab}\) = 10101 . \(\overline{ab}\) = 1443 . 7 . \(\overline{ab}\)

\(\Rightarrow\) \(\overline{ababab}\) \(⋮\) 7

Answer 2

\(\overline{ababab}⋮7\)

\(\Rightarrow\overline{ababab}=10101.\overline{ab}=1443.7.\overline{ab}\)

\(\Rightarrow\overline{ababab}⋮7\)