37.
2 с = 2/60 = 1/30
18 с = 18/60 = 3/10
27 с = 27/60 = 9/20
45 с = 45/60 = 3/4
38.
6° = 6/90 = 1/15
24° = 24/90 = 4/15
27° = 27/90 = 3/10
30° = 30/90 = 1/3
48° = 48/90 = 8/15
39.
5/18 + 4/18 = 9/18 = 1/2
25/34 - 8/24 = 17/34 = 1/2
3 13/45 + 6 17/45 = 9 30/45 = 9 2/3
12 43/56 - 7 22/56 = 5 21/56 = 5 3/8
40.
6 * 14 1 * 2
-------- = ------- = 2/5 = 0,4
7 * 30 1 * 5
22 * 10 2 * 2
-----------= ------- = 4/9
15 * 33 3 * 3
9 * 2 * 3 1 * 1 * 1 1
------------- = ------------- = ------
8 * 18 * 21 4 * 2 * 7 56
8 * 7 + 8 * 3 8 * (7 + 3) 8 * 10 2 * 5
---------------------- = --------------------= --------------- = ---------- = 2/8 = 1/4
16 * 25 - 16 * 5 16 * (25 - 5) 16 * 20 8 * 5