Ответ:

Пошаговое объяснение:

1) 3/4 - 1/6 + 1/2 = 9/12 - 2/12 + 6/12 =
(9-2+6)/12 = 13/12 = 1 1/12

2) 4/9 + 5/6 - 3/4 = 16/36 + 30/36 - 27/36 =
(16+30-27)/36 = 19/36

3) 4/15 - 2/45 + 7/9 = 12/45 - 2/45 + 35/45 = (12-2+35)/45 = 45/45 = 1

4) 6/7 - 1/4 - 5/14 = 24/28 - 7/28 - 10/28 =
(24-7-10)/28 = 7/28 = 1/4

5) 3/5 - 7/50 + 3/10 = 30/50 - 7/50 + 15/50 = (30-7+15)/50 = 38/50 = 19/25

6) 2/7 + 3/8 - 1/4 = 16/56 + 21/56 - 14/56 =
(16+21-14)/56 = 23/56

7) 5/11 + 5/6 + 1/3 = 30/66 + 55/66 + 22/66 = (30+55+22)/66 = 107/66 = 1 41/66