Question

Bài 3:Chứng tỏ rằng:

a) Nếu (abc-def) chia hết cho 13 thì abcdef chia hết cho  13

Answer 1

Ta có: \(\overline{abc}-\overline{def}\) ⋮13

\(1001\cdot\overline{abc}\) ⋮13(Vì \(1001=77\cdot13\) )

=>\(1001\cdot\overline{abc}-\left(\overline{abc}-\overline{def}\right)\) ⋮13

=>\(\overline{abc}\cdot1000+\overline{def}\) ⋮13

=>\(\overline{abcdef}\) ⋮13