Розділ 6. Звичайні дроби » 1019

Знайдіть суму чисел: 1) 35/7 + 42/7 = (3 + 4) + (5/7 + 2/7) = 7 + 7/7 = 77/7 = 8 2) 52/9 + 87/9 = (5 + 8) + (2/9 + 7/9) = 13 + 9/9 = 13 + 1 = 14 3) 313/15 + 114/15 = (3 + 11) + (13/15 + 4/15) = 14 + 17/15 = 15 + 2/15 = 152/15 4) 712/19 + 813/19 = (7 + 8) + (12/19 + 13/19) = 15 + 25/19 = 15 + 1 + 6/19 = 166/19 5) 1615/23 + 1015/23 = (16 + 10) + (15/23 + 15/23) = 26 + 30/23 = 26 + 1 + 7/23 = 277/23 6) 1911/30 + 2222/30 = (19 + 22) + (11/30 + 22/30) = 41 + 33/30 = 41 + 1 + 3/30 = 423/30