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a).1 2/7:4/5=9/7*5/4=45/28=1 17/28
b).2 7/10:1 2/7=27/10*7/9=189/90=2 9/90
c).3 3/4:1 7/8=15/4*8/15=120/60=2
zadanie 6 i zadanie 7 masz w załączniku