Выполните вычитание: 1)7/8-(-3/10) 2)11/12-17/18 3)-3/7-9/14 4)-5/9-(-3/4) 5)3 11/12-(-4 4/9)

Выполним действия, для этого приведем дроби к общему знаменателю:

1) 7/8 - (-3/10) = 7/8 + 3/10 = (7 * 5)/40 + (3 * 4)/40 = 35/40 + 12/40 = (35 + 12)/40 = 47/40 = 1 7/40;

2) 11/12 - 17/18 = (11 * 3)/36 - (17 * 2)/36 = 33/36 - 34/36 = (33 - 34)/36 = -1/36;

3) -3/7 - 9/14 = -(3 * 2)/14 - 9/14 = -6/14 - 9/14 = (-6 - 9)/14 = -15/14 = -1 1/14;

4) -5/9 - (-3/4) = -5/9 + 3/4 = 3/4 - 5/9 = (3 * 9)/36 - (5 * 4)/36 = 27/36 - 20/36 = 7/36;

5) 3 11/12 - (-4 4/9) = 3 11/12 + 4 4/9 = 3 + 4 + 11/12 + 4/9 = 7 + (11 * 3)/36 + (4 * 4)/36 = 7 + 33/36 + 16/36 = 7 + 49/36 = 7 + 1 13/36 = 8 13/36.