Date: 2018-02-15 08:59 am (UTC)
From: [identity profile] raf-sh.livejournal.com
a, b, c - цифры числа.

100a + 10b + c -792 = 100c +10b +a
99a - 99c = 792
a - c = 8
Тогда a = 9, c = 1 (другие невозможны)
9z1 - геом. прогрессия, z = 3

931
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