Odpowiedź:
1/2 - p = 3/7
p = 1/2 - 3/7 = 7/14 - 6/14 = 1/14
p = 1/14
sprawdzenie 1/2 - 1/14 = 7/14 - 1/14 = 6/14 = 3/7
1 i 1/5 - u = 5/6
u = 1 i 1/5 - 5/6 = 1 i 6/30 - 25/30 = 36/20 - 25/30 = 11/30
u = 11/30
spr 1 i 1/5 - 11/30 = 1 i 6/30 - 11/30 = 36/30 - 11/30 = 25/30 = 5/6
