Odpowiedź:
1. 5/18 - 1/6 = 5/18 - 3/18 = 2/18
2. 1 i 5/18 + 1 i 2/9 = 1 i 5/18 + 1 i 4/18 =
2 i 9/18
3. 2/3 - 4/9 = 6/9 - 4/9 = 2/9
4. 3/4 - 7/8 = 6/8 - 7/8 = (-1/8)
5. 4/5 - 3/10 = 8/10 - 3/10 = 5/10
6. 2/9 + 1/3 = 2/9 + 3/9 = 5/9
7. 5/8 + 7/14 = 35/56 + 28/56 = 63/56 =
= 1 i 7/56
8. 3/10 - 1/8 = 12/40 - 5/40 = 7/40
9. 7/10 - 5/12 = 42/60 - 25/60 = 17/60
10. 1 i 3/8 + 2 i 5/16 = 1 i 6/16 + 2 i 5/16 =
= 3 i 11/16
11. 1 i 1/2 + 2 i 1/5 = 1 i 5/10 + 2 i 2/10 =
= 3 i 7/10
12. 2 i 3/8 + 5 i 7/12 = 2 i 18/48 +
+ 5 i 28/48 = 7 i 46/48
13. 1/2 + 2 i 5/14 = 8/14 + 2 i 5/14 =
= 2 i 13/14
14. 2 i 1/2 - 9/10 = 2 i 5/10 - 9/10 =
= 1 i 6/10
15. 1 i 13/15 - 5/12 = 1 i 52/60 - 25/60 =
= 1 i 27/60
16. 1/2 + 1/5 + 1/7 = 35/70 + 14/70 +
+ 10/70 = 59/70
17. 5/8 + 1/9 - 2/3 = 40/72 + 8/72 - 48/72 = 0
