2 3/4 : ((4 5/7 - 1 11/14) * 4 2/3 + (3 2/9 - 1 5/6) * 18/25)=3/16
по действиям
4 5/7 - 1 11/14=4 10/14 - 1 11/14=3 10/14 - 11/14=3-1/14=2 13/14=41/14
41/14*4 2/3=41/14*14/3=41/3=13 2/3
3 2/9 - 1 5/6=3 4/18-1 15/18=2 4/18-15/18=2-11/18=1 7/18=25/18
25/18*18/25=1
13 2/3+1=14 2/3=44/3
2 3/4:44/3=11/4*3/44=1/4*3/4=3/16