1/6+1/10=8/30
8/30+1/15=10/30
8/30-1/15=6/30
10/30:6/30=10/6=5/3
1/2-1/3=1/6
0,25-0,2=0,05=1/20
1/6+1/20=13/60
0,25-1/6=1/12
13/60:1/12=13/5
5/3:13/5=25/39
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1/6+1/10=8/30
8/30+1/15=10/30
8/30-1/15=6/30
10/30:6/30=10/6=5/3
1/2-1/3=1/6
0,25-0,2=0,05=1/20
1/6+1/20=13/60
0,25-1/6=1/12
13/60:1/12=13/5
5/3:13/5=25/39