7/26-1/39
сравните 39/40 40/41
7/26-1/39= 21/78-2/78=19/78
39/40 < 40/41
1599/1640 1600/1640
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7/26-1/39= 21/78-2/78=19/78
39/40 < 40/41
1599/1640 1600/1640