6100:100 61*100 61:1 20:29
6100:100=61 61*100=6.100 61:1=61 20:29=0,69
6100:100=61
61*100=6100
61:1=61
20:29=0.689...
спосиба
61=6100:100 61=61:1 20 29 дробь! = 20:29