Odpowiedź: a)2 7/9 + 3 8/9 = 25/9 + 35/9
25/9 + 35/9 = (25+35)/9
(25+35)/9 = 60/9
60/9 = 20/3
20/3 = 6 2/3
b)6 1/2 + 3 1/4 = 26/4 + 13/4
26/4 + 13/4 = (26+13)/4
(26+13)/4 = 39/4
39/4 = 9 3/4
c)1 4/5 - 5 2/10 = 18/10 - 52/10
18/10 - 52/10 = (18-52)/10
(18-52)/10 = -34/10
-34/10 = -17/5
-17/5 = -3 2/5
d)13 - 10 3/5 = 65/5 - 53/5
65/5 - 53/5 = (65-53)/5
(65-53)/5 = 12/5
12/5 = 2 2/5
Szczegółowe wyjaśnienie:
