Odpowiedź:
1. a) 17/2 = 8 1/2
8/3 = 2 2/3
b) 2 1/7 = 15/7
22/9
2. a) 1/2 + 2/5 = 5/10 + 4/10 = 9/10
b) 3/4 - 1/7 = 21/28 - 4/28 = 17/28
3. a) 2 3/5 + 1 3/4 = 13/5 + 7/4 = 52/20 + 35/20 = 87/20
b) 4 2/3 - 2 7/8 = 14/3 - 23/8 = 112/24 - 69/24 = 43/24
4. A) 15 * 4 2/3 = 60 2/3
b) 1 1/3 * 3 3/4 = 1 4/12 * 3 9/12 = 16/12 * 45/12 = 720/12 = 60 (/1)
c) 3 3/4 : 12 = 1/15 * 12 = 12/15 = 4/5
d) 7 1/3 : 1 4/7 = 22/3 * 7/12 = 88/12 * 7/12 = 616/12 = 154/3
5. a)>
b)<
c)<
d)>
6. D:
28 - wszyscy
2/7 - chlopy
1/4 - harcerze z chlopcow
2/7 z 28 = 8 (poniewaz 28 : 7 = 4 2 * 4 = 8)
1/4 z 8 = 2 (poniewaz 8:4 = 2)
ODP. 8 - liczba chlopcow, 2 - harcerze
