(3 1/4+2 1/6):2 3/5-2/3*2 1/4+5 1/6=(3 3/12+2 2/12):13/5-2/3*9/4+5 1/6=
(5 5/12):13/5-2/1*3/4+5 1/6=65/12*5/13-1/1*3/2+5 1/6=
325/156-3/2+31/6=325/156-234/156+806/156=897/156=5,75
(5 9/11:1 2/9-7 2/3* 1 1/23) / (11/54-5/36)=
(64/11:11/9-23/3* 24/23) / (22/108-15/108)=
(64/11*9/11-1/3* 24/1) / (7/108)= (576/121-1/1* 8/1) * 108/7=
(576/121-8) * 108/7=(576/121-968/121) * 108/7=
-392/121 * 108/7=-56/121 * 108/1=-6048/121=-49 119/121