Odpowiedź:
zad. 12
a)
2 i 1/5 + 3 i 9/10 = 2 i 2/10 + 3 i 9/10 = 5 i 11/10 = 6 i 1/10
b)
1 i 8/9 + 5 i 4/7 = 1 i 56/63 + 5 i 36/63 = 6 i 92/63 = 7 i 29/63
c)
7 i 1/15 + 5 i 13/30 = 7 i 2/30 + 5 i 13/30 = 12 i 15/30 = 12 i 1/2
d)
7 i 5/6 + 2 i 2/9 = 7 i 15/18 + 2 i 4/18 = 9 i 19/18 = 10 i 1/18
zad.13
a)
15 i 5/8 + 1 i 6/7 = 15 i 35/56 + 1 i 48/56 = 16 i 83/56 = 17 i 27/56
b)
12 i 9/10 + 9 i 3/4 = 12 i 18/20 + 9 i 15/20 = 21 i 33/20 = 22 i 13/20
c)
14 i 7/12 + 2 i 7/16 = 14 i 28/48 + 2 i 21/48 = 16 i 49/48 = 17 i 1/48
d)
21 i 13/27 + 16 i 17/18 = 21 i 26/54 + 16 i 51/54 = 37 i 77/54 = 38 i 23/54
Szczegółowe wyjaśnienie:
