Please write three six digit numbers that can be divided by 7, 11 and 13 at the same time______ .
1001×123=123123,1001×456=456456,1001×789=789789,1000×234=234234… Therefore, the answer is: 123123456456789789
If abcabc can be divided by 11, then abccba can be divided by 11
abcabc
=abc×1001
=abc×7×11×13
So it's divisible by 11
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