Составляем примеры с дробями и приводим их к общему знаменателю.1/2 + 1/3 =.Общий знаменатель для данных дробей равен 6.1/2 + 1/3 = (3 × 1)/6 + (2 × 1)/6 = 3/6 + 2/6 = (3 + 2)/6 = 5/6.2/5 + 4/3 = (2 × 3)/15 + (4 × 5)/15 = 6/15 + 20/15 = (6 + 20)/15 = 26/15 = 1 11/15.5/6 - 4/7 = (5 × 7)/42 - (4 × 6)/42 = 35/42 - 24/35 = (35 - 24)/35 = 11/35.6/7 - 1/3 = (6×3)/21 - (1 × 7)/21 = 18/21 - 7/21 = 11/21.4/5 + 1 = 4/5 + 5/5 = 9/5 = 1 4/5.3/2 + 5/6 = 9/6 + 5/6 = 14/6 = 2 2/6.3/11 - 1/22 = 3×2/22 - 1/22 = 6/22 - 1/22 = 5/22.7/5 - 1/6 = 42/30 - 5/30 = 37/30 = 1 7/30. 1 1/2 + 3/4 = 3/2 + 3/4 = 6/4 + 3/4 = 7/4.5/3 - 1/4 = 20/12 - 3/12 = 17/12 = 1 5/12.