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21. a ) 1/2*1/3=1/6 3/4*1/2=3/6=1/2
b) 3/8*3/2=9/18=1/2 , 3/7*4=12/7
c) 2/7*3/5=6/35 , 17/7*2/5=34/35
2.Kokardka 1,2
3.Kokardka 0,75
4.Kokardka 4
5.Kokardka 3,5
Zd 21
a) 1,5
3/8
b)9/16
1 i 5/7
Dalej nie chce mi sie robićXD