Odpowiedź:
a)
2/3 + 3/4 = 8/12 + 9/12 = 17/12 = 1 5/12
b)
3/7 - 1/5 = 15/35 - 7/35 = 8/35
c)
4 3/5 + 5/7 = 4 21/35 + 25/35 = 4 46/35 = 5 11/35
d)
6 1/5 - 2 4/7 = 6 7/35 - 2 20/35 = 5 42/35 - 2 20/35 = 3 22/35
e)
7 * 3/8 = 21/8 = 2 5/8
f)
2 1/3 * 1 2/7 = 7/3 * 9/7 = 3
g)
6/21 : 9/14 = 6/21 * 14/9 = 2/3 * 2/3 = 4/9
h)
2 4/7 : 1 2/5 = 18/7 : 12/5 = 18/7 * 5/12 = 15/14 = 1 1/14
Szczegółowe wyjaśnienie:
