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1 1/2:10= 3/2:10/1=3/2*1/10=3/20
3/20:0,05= 3/20:5/100=3/20*100/5=300/100=3
3:1 1/5= 3/1:6/5= 3*5/6=15/6=2 3/6= 2 1/2
B) 4,5:1/3=45/10*3= 135/10=13 5/10=13 1/2
13 1/2:2 1/4= 27/2*4/9=108/18=6
6:0,3= 6 :3/10= 6*10/3=60/3=20
20:8= 20*1/8=2 4/8= 2 1/2