........=51,5
1) 19 1/6+43,75=19 1/6+43 3/4=19 2/12+43 9/12=62 11/12
2) 62 11/12:5/6=755/12 * 6/5=151/2
3) 13,3-11,5=1,8=1 4/5
4) 1 4/5 : 1 4/6=9/5 * 3/5=27/25
5) 151/2 : 27/25=151/2 * 25/27=4077/54=75 27/54=75 1/2
6) 26,8-23 3/7=26 4/5 - 23 3/7=26 28/35 - 23 15/35=3 2/35
7) 3 2/35 : 6/35=72/35 * 35/6=12
8) 12:0,5=24
9) 75 1/2 - 24=75,5 - 24=51,5