§ 5. Звичайні дроби » 1074

Обчисліть суму: 1) 4 + 2/5 = 42/5 2) 4/9 + 31/9 = 3 + (4/9 + 1/9) = 3 + 5/9 = 35/9 3) 32/7 + 43/7 = (3 + 4) + (2/7 + 3/7) = 75/7 4) 52/3 + 21/3 = (5 + 2) + (2/3 + 1/3) = 73/3 = 8 5) 29/10 + 47/10 = (2 + 4) + (9/10 + 7/10) = 6 + 16/10 = 76/10 6) 13/5 + 12/5 + 31/5 = (1 + 1 + 3) + (3/5 + 2/5 + 1/5) = 56/5 = 61/5