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=62/30*1/4-1/4 (przy mnożeniu skróć 62 i 4 przez 2) =31/60-1/4=31/60-15/60=
=16/60=4/15
b)3 i 3/5-3/5+2 i 1/3=18/5-3/5+7/3=54/15-9/15+35/15=80/15=5 i 5/15=5 i 1/3
c) 12+8
5* ------------ = 5*20/13=5/1*20/13=100/13=7 i 9/13
5+8