Odpowiedź:
1 i 1/8 + 2/5 = 1 i 5/40 + 16/40 = 1 i 21/40
4 i 2/3 + 2 i 3/5 = 4 i 10/15 + 2 i 9/15 = 6 i 19/15 = 7 i 4/15
4 i 3/4 - 2 i 3/5 = 4 i 15/20 - 2 i 12/20 = 2 i 3/20
6 i 1/10 - 2 i 3/5 = 6 i 1/10 - 2 i 6/10 = 5 i 11/10 - 2 i 6/10 = 3 i 5/10 = 3 i 1/2
zad 14
1/3 + 1/8 + 1/6 = 8/24 + 3/24 + 4/24 = 15/24
1 i 3/4 + 2 i 4/5 + 3 i 3/10 = 1 i 15/20 + 2 i 16/20 + 3 i 6/20 = 6 i 37/20 = 7 i 17/20
10 - (5 i 1/4 - 1 i 5/6) = 10 - (5 i 3/12 - 1 i 10/12) = 10 - (4 i 15/12 - 1 i 10/12) = 10 - 3 i 5/12 = 9 i 12/12 - 3 i 5/12 = 6 i 7/12
