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Answer 1

A)
(2/3 - 1/2) / (3/4 - 2/3) = 
(4/6 - 3/6) / (9/12 - 8/12) = 
1/6 : 1/12 = 1/6  * 12/1 = 12/6 = 2 

b) 
(1 i 1/2 - 2,75) / (1 i 5/6 - 2 i 1/12) =
(3/2 - 2 i 3/4) / (11/6 - 25/12) = 
(3/2 - 11/4) / (11/6 - 25/12) = 
(6/4 - 11/4) / (22/12 - 25/12) = 
-5/4 : -3/12 = 
-5/4 * - 12/3 = 60/12 = 5

c)
(8 - (-2 i 1/2)) / (1 i 4/5 : 14/15  - 2) = 
(8 + 2 i 1/2) / (9/5 : 14/15 - 2) = 
10 i 1/2 / ( 9/5 * 15/14 - 2) = 
21/2 / (135/70 - 4/2) = 
21/2 / (135/70 - 140/70) =
21/2 : -5/70 =
21/2 * -14/1 = -294/2 =  -147

d) 
(1 i 2/3 - 2 i 1/3 - 3 i 1/2) / 3 : (5/12 - 5/6) = 
(5/3 - 7/3 - 7/2) / 3 : ( 5/12 - 10/12) = 
(10/6 - 14/6 - 21/6) / 3 * -5/12 = 
-25/6 : -15/12 = 
- 25/6 * -12/15 = 300/90 = 3 i 30/90= 3 i 1/3