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b) 12 : 6/11 =12/1*11/6= 132/6=22
c) 4 i 2/7 : 3 i 1/8 =30/7:25/8=30/7*8/25= 240/175= 48/35
Oblicz.
2/15 : 4 × 3 i 3/4 =2/15 :4/1*3i3/4=2/15*1/4*3i3/4= 2/60*3i3/4= 2/60*15/4= 30/240 1/80