Odpowiedź:
Szczegółowe wyjaśnienie:
5) Oblicz:
a) 1. 1/3+4/5 = 3/3 + 1/3 + 4/5 = 15/15 + 5/15 +12/15 =
= 32/15 = 30/15 + 2/15 = 2 + 2/15= 2 2/15
b) 2. 5/7+ 1. 3/8 = 14/7 + 5/7 + 8/8 + 3/8 =
= 19/7 + 11/8 = 19*8/7*8 + 11*7/8*7 = 152/56 + 77/56 =
= 229/56 = 224/56+ 5/56 = 4 + 5/56 = 4 5/56
c) 5/9+5/6 = 10/18 + 15/18 = 25/18 = 18/18 + 7/18 = 1 + 7/18 = 1 7/18
