Розділ 6. Звичайні дроби » 1029

Обчисліть: 1) 43/7 – 23/7 = (4 – 2) + (3/7 – 3/7) = 2 2) 95/8 – 65/8 = (9 + 5/8) – (6 + 5/8) = (9 – 6) + (5/8 – 5/8) = 3 + 0 = 3 3) 1211/15 – 911/15 = (12 – 9) + (11/15 – 11/15) = 3 4) 55/7 – 33/7 = (5 + 5/7) – (3 + 3/7) = (5 – 3) + (5/7 – 3/7) = 2 + 2/7 = 22/7 5) 86/11 – 65/11 = (8 + 6/11) – (6 + 5/11) = (8 – 6) + (6/11 – 5/11) = 21/11 6) 717/20 – 310/20 = (7 – 3) + (17/20 – 10/20) = 4 + 7/20 = 47/20 7) 1015/23 – 37/23 = (10 – 3) + (15/23 – 7/23) = 7 + 8/23 = 78/23 8) 2511/31 – 94/31 = (25 – 9) + (11/31 – 4/31) = 16 + 7/31 = 167/31 9) 5014/40 – 223/40 = (50 – 22) + (14/40 – 3/40) = 28 + 11/40 = 2811/40