abcabc = c + 10b + 100a + 1000c + 10000b + 100000a = 1001c + 10010b + 100100a = 1001*(c + 10b + 100a) = 7*11*13(c + 10b +100a) значит делитися на 7 11 и 13
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abcabc = c + 10b + 100a + 1000c + 10000b + 100000a = 1001c + 10010b + 100100a = 1001*(c + 10b + 100a) = 7*11*13(c + 10b +100a) значит делитися на 7 11 и 13