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b) 3/4:1/15=3/4•15/1=45/4=11i1/4
c) nie widac
d) 4/9:5/11=4/9•11/5=44/45
e) 1/4:7/9=1/4•9/7=9/28
f)nie widac
g)1/6:7/11= 1/6•11/7=11/42
h) 4/7:13/15=4/7•15/13= 60/91