Ответы: 2
Милена Тищенко
2017-11-14 16:56
20/31 = (2/2 * 20/31) = 40/62, 20/31 = (4/4 * 20/31) = 80/124, 20/31 = (9/9 * 20/31) = 180/279, 20/31 = (10/10 * 20/31) = 200/310

Вадим Маляренко
2017-11-15 08:47
20/31 = 40/62, 20/31 = 80/124, 20/31 = 180/279, 20/31 = 200/310