Відповіді до завдань 802 - 900 » 897

1) 521/25 - 34/25 = 5 + 21/25 - (3 + 4/25) = (5 – 3) + (21/25 - 4/25) = 2 + + 17/25 =217/25; 2) 717/28 - 38/28 = (7 + 17/28) –(3 +8/28) = (7 – 3) + (17/28 - 8/28) = 4 + 9/28 = 49/28; 3) 911/19 - 44/19 = (9 + 11/19) –(4 +4/19) = (9 – 4) + (11/19 - 4/19) = 5 + 7/19 = 57/19; 4) 86/15 - 67/15 = (8 + 6/15) –(6 +7/15) = (8 – 6) + 6/15 - 7/15 = 1 + (1 + 6/15 - - 7/15 = 1 + (21/15 - 7/15) = 1 + 14/15 = 114/15; 5) 108/11 - 32/11 = (10 – 3) + (8/11 - 2/11) = 7 + 6/11 = 76/11; 6) 117/13 - 22/13 = (11 – 2) + (7/13 - 2/13) = 9 + 5/13 = 95/13.