Предварительно сократив дроби,найдите значение выражения : 3/12+25/30, 10/24-21/54, 30/54+22/30, 28/40-10/75, 12/27+14/21, 14/24-15/40, 12/18-5/60, 4/24+3/36

3/12 + 25/30 = 1/4 + 5/6 = 3/12 + 10/12 = 13/12 = 1 1/12
10/24 - 21/54 = 5/12 - 7/18 = 15/36 - 14/36 = 1/36
30/54 + 22/30 = 5/9 + 11/15 = 25/45 + 33/45 =58/45 = 1 13/45
28/40 - 10/75 = 7/10 -2/15 = 21/30 - 20/30 =1/30
12/27 +14/21 = 4/9 + 2/3 = 4/9 + 6/9 = 10/9 = 1 1/9
14/34 - 15/40 = 7/12 - 3/8 = 14/24 - 9/24 = 5/24
12/18 - 5/60 = 2/3 - 1/12 = 8/12 - 1/12 = 7/12
4/24 +3/36 = 1/6 + 1/12 = 2/12 + 1/12 = 3/12 = 1/4