Odpowiedź:
a) 3/4 - 1/7 = 21/28 - 3/28 = 18/28 = 9/14
7/10 - 4/15 = 21/30 - 8/30 = 13/30
3/14 - 1/5 = 15/70 - 14/70 = 1/70
b) 2 i 3/5 - 7/10 = 1 i 16/10 - 7/10 = 1 i 9/10
2 i 3/8 - 1 i 5/6 = 1 i 33/24 - 1 i 20/24 = 13/24
3 i 1/6 - 2 i 3/4 = 2 i 28/24 - 2 i 18/24 = 10/24 = 5/12
Szczegółowe wyjaśnienie:
