Odpowiedź :
a) 3/5 + 1/15 = 9/15 + 1/15 = 10/15 = 2/3
b) 2/7 + 5/6 = 12/42 + 35/42 = 47/42 = 1 5/42
c) 1 3/4 + 4 3/7 = 1 21/28 + 4 12/28 = 5 33/28 = 6 5/28
d) 1 7/9 + 2 5/6 = 1 14/18 + 2 15/18 = 3 29/18 = 4 11/18
3/5+ 1/15=9/15+1/15=10/15=2/3
2/7+5/6=12/42+35/42=47/42=1 5/42
1 3/4+4 3/7= 1 21/28+4 12/28= 5 33/28
Szczegółowe wyjaśnienie: