Odpowiedź:
A)
5 4/7-2/7 = 5 2/7
7 6/9 - 4/9 = 7 2/9
5 4/7 - 3/7 = 5 1/7
7 6/9 - 4/9 = 7 2/9
B)
4 2/7 - 3 = 1 2/7
9 6/17 - 5 - 4 6/17
15 4/11 - 14 = 1 4/11
19 17/19 - 17 = 2 17/19
C)
5 4/7 - 2 2/7 = 3 2/7
9 6/11 - 6 4/11 = 3 2/11
12 8/15 - 12 4/15 = 4/15
27 16/19 - 1 3/19= 26 13/19
Szczegółowe wyjaśnienie: