Відповіді до завдань 802 - 900 » 899

1) 55/11 - 49/11 = (4 +(1 + 5/11)) - (4 + 9/11) = (4 – 4) + (16/11 - 9/11) = = 0 + 7/11 = 7/11; 2) 138/9 - 114/9 = (13 + 8/9) –(11 +4/9) = (13 – 11) + (8/9 - 4/9) = 2 + 4/9 = 24/9; 3) 65/7 - 44/7 = (6 + 5/7) –(4 +4/7) = (6 – 4) - (5/7 - 4/7) = 21/7; 4) 58/9 - 42/9 = (5 + 8/9) –(4 +2/9) = (5 – 4) + (8/9 - 2/9) = 1 + 6/9 = 16/9; 5) 911/15 - 83/15 = (9 + 11/15) –(8 +3/15) = (9 – 8) + (11/15 - 3/15) = 1 + 8/15 = 18/15; 6) 1111/13 - 97/13 = (11 + 11/13) –(9 +7/13) = (11 – 9) + (11/13 - 7/13) = 2 + 4/13 = 24/13; 7) 53/9 - 31/9 = (5 + 3/9) –(3 +1/9) = (5 – 3) + (3/9 - 1/9) = 2 + 2/9 = 22/9; 8) 38/13 - 25/13 = (3 + 8/13) –(2 +5/13) = (3 – 2) + (8/13 - 5/13) = 1 + 3/13 = 13/13; 9) 810/17 - 47/17 = (8 + 10/17) –(4 +7/17) = (8 – 4) + (10/17 - 7/17) = 4 + 3/17 = 43/17.