Ta có: abcabc = abc000  + abc 

                      = abc x 1000 + abc 

                      = abc . (1000 + 1)

                      = abc . 1001

                      = abc . 7 . 11 . 13

Vậy số abcabc là tích của abc với 7; 11; 13 => abcabc chia hết cho 7; 11 và 13

nhầm 202 lăm nhá

202 nhá viết nhầm

ae 202 đâu ròi

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ae 2025 đâu rùi

ae 2025 đầu rồi !!!!!!!!!!!!!!

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