Odpowiedź:
a)
1/3 + 3/4 = 4/12 + 9/12 = 13/12 = 1 1/12
2/3 + 3/7 = 14/21 + 9/21 = 23/21 = 1 2/21
5/6 + 8/9 = 20/36 + 32/36 = 52/36 = 1 16/36 = 1 4/9
b)
3 3/4 + 1 1/6 = 3 9/12 + 1 2/12 = 4 11/12
2 8/9 + 1 7/10 = 2 80/90 + 1 63/90 = 3 143/90 = 4 53/90
4 5/9 + 5 1/6 = 4 10/18 + 5 3/18 = 9 13/18
c)
3/4 - 2/5 = 15/20 - 8/20 = 7/20
7/8 - 3/5 = 35/40 - 24/40 = 11/40
2 5/6 - 3/4 = 2 10/12 - 9/12 - 2 1/12
d)
5 7/9 - 1 1/2 = 5 14/18 - 1 9/18 = 4 5/18
7 5/6 - 3 4/5 = 7 25/30 - 3 24/30 = 4 1/30
2 1/4 - 2 1/6 = 2 3/12 - 2 2/12 = 1/12
Szczegółowe wyjaśnienie:
