Odpowiedź:
1.
a)
5 2/3 + 2 3/4 = 5 8/12 + 2 9/12 = 7 17/12 = 8 5/12
b)
6 1/2 - 2 7/9 = 6 9/18 - 2 14/18 = 5 27/18 - 2 14/18 = 3 13/18
c)
1 1/5 * 2 2/9 = 6/5 * 20/9 = 2 * 4/3 = 8/3 = 2 2/3
d)
2/5 : 8 = 2/5 * 1/8 = 1/20
2.
a)
8 3/4 + 1 1/4 : 3 3/4 = 8 3/4 + 5/4 : 15/4 = 8 3/4 + 5/4 * 4/15 = 8 3/4 + 1/3 =
= 8 9/12 + 4/12 = 8 13/12 = 9 1/12
b)
(4 2/5 - 2 3/4) * (2/3 + 1/11) = (4 8/20 - 2 15/20) * (22/33 + 3/33) =
= (3 28/20 - 2 15/20) * 25/33 = 1 13/20 * 25/33 = 33/20 * 25/33 = 5/4 = 1 1/4
Szczegółowe wyjaśnienie:
