Дополните данную дробь до 1 вставив пропущеное число: 3/4+_=1
2/7+_=1
1/6+_=1

1 - 3/4 = (4-3)/4 = 1/4 => 3/4 + 1/4 = 11 - 2/7 = (7-2)/7 = 5/7 => 2/7 + 5/7 = 11 - 1/6 = (6 - 1) / 6 = 5/6 => 1/6 + 5/6 = 1