Odpowiedź:
1.
b)
2 6/7 + 5/6 = 2 36/42 + 35/42 = 2 71/42 = 3 29/42
9 7/8 + 3/5 = 9 35/40 + 24/40 = 9 59/40 = 10 19/40
6 6/7 + 4/5 = 6 30/35 + 28/35 = 6 58/35 = 7 23/35
11/12 + 1 9/15 = 11/12 + 1 3/5 = 55/60 + 1 36/60 = 1 91/60 = 2 31/60
2.
b)
2 11/12 - 4/9 - 2 33/36 - 12/36 = 2 21/36
10 13/15 - 5/6 = 10 26/30 - 25/30 = 10 1/30
11 1/4 - 5/8 = 11 2/8 - 5/8 = 10 10/8 - 5/8 = 10 5/8
15 1/2 - 4 3/4 = 15 2/4 - 4 3/4 = 14 6/4 - 4 3/4 = 10 3/4
c)
9 5/9 - 2 4/5 = 9 25/45 - 2 36/45 = 8 70/45 - 2 36/45 = 6 34/45
8 5/8 - 7 5/6 = 8 30/48 - 7 40/48 = 7 78/48 - 7 40/48 = 38/48 = 19/24
15 1/11 - 6 3/4 = 15 4/44 - 6 33/44 = 14 48/44 - 6 33/44 = 8 15/44
24 5/13 - 14 2/3 = 24 15/39 - 14 26/39 = 23 54/39 - 14 26/39 = 9 28/39
Szczegółowe wyjaśnienie:
