Oblicz pamiętając o kolejności wykonywania działań a) 9 7/12 - 7 4/15 + 2 3/4 - 1 11/20 = ? b) 20-(17 3/20 + 1 13/15) c) 30 5/12 - (13 1/8 - 10 5/6) =
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a) 9i7/12-7i4/15+2i3/4-1i11/20=9i35/60-7i16/60+2i45/60-1i33/60=11i80/60-8i49/60=3i31/60
b)20-(17i3/20+1i13/15)=20-(17i9/60+1i52/60)=20-18i61/60=20-19i1/60=59/60
c)30i5/12-(13i1/8-10i5/6)=30i10/24-(13i3/24-10i20/24)=30i10/24-2i7/24=28i3/24=28i1/8