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b 4/6*1/2 (skracamy przez 2 i 3)=1/4
c 3/4*8/9 (skracamy przez 2 i 3)=2/3
d 7/15*10/21=2/9
e 11/4*1/2= 1 3/8
f 5/9*41/10=41/18=2 5/18
g 5/2*16/3=40/3=13 1/3