Odpowiedź :
Odpowiedź:
5/8 + 3/10 = 25/40 + 12/40 = 37/40
b) 2 3/4 + 1/6 = 2 9/12 + 2/12 = 2 11/12
4 8/9 + 2 7/10 = 4 80/90 + 2 53/90 = 6 133/90 = 7 43/90
2 7/9 + 3 1/6 = 2 14/18 + 3 3/18 = 5 17/18
3 7/15 + 2 9/10 = 3 14/30 + 2 27/30 = 5 41/30 = 6 11/30
c) 3/4 - 3/5 = 15/20 12/20 = 3/20
7/8 - 2/5 = 35/40 - 16/40 = 19/40
3/8 - 1/6 = 9/24 - 4/24 = 5/24
1 5/6 - 3/4 = 1 10/12 - 9/12 = 1 1/12
4 5/9 - 1 1/2 = 4 10/18 - 1 9/18 = 3 1/18
8 5/6 - 2 4/5 = 8 25/30 - 2 24/30 = 6 1/30
3 1/4 - 1 1/6 = 3 3/12 - 1 2/12 = 2 1/12
8 3/4 - 1 7/10 = 8 30/40 - 1 28/40 = 7 2/40 = 7 1/20
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