Odpowiedź:
B.
d)
4/7 - 1/6 = 24/42 - 7/42 = 17/42
e)
3/7 + 1/4 = 12/28 + 7/28 = 19/28
C.
d)
2/3 - 2/4 = 2/3 - 1/2 = 4/6 - 3/6 = 1/6
e)
5/9 + 1/2 = 10/18 + 9/18 = 19/18 = 1 1/18
D.
d)
4/9 - 5/12 = 16/36 - 15/36 = 1/36
e)
7/15 + 9/10 = 14/30 + 27/30 = 41/30 = 1 11/30
Szczegółowe wyjaśnienie:
