№745
23 1/21:1 3/7=484/21*7/10=242/15=16 2/15
16 2/15-5,5=16 2/15-5 1/2=16 4/30-5 15/30=15 34/30-5 15/30=10 19/30
10 19/30:3,19=319/30:3 19/100=319/30*100/319=10/3=3 1/3
3 1/3-1 17/18=3 6/18-1 17/18=2 24/18-1 17/18=1 7/18
-------------------------------------
64 1/11:4 6/11=705/11*11/50=705/50=14 1/10
14 1/10-0,8=14 1/10-4/5=14 1/10-8/10=13 11/10-8/10=13 3/10
13 3/10:9,5=13 3/10:9 1/2=133/10*2/19=7/5=1 2/5
1 2/5+108,2=1 2/5+108 1/5=109 3/5