(5/6-3/10): (5/6-1/12-3/5)+((2(1-1/2): 3)

1) 2(1-1/2):3=2*1/(2*3)=1/3;

2) 5/6-1/12-3/5=10/12-1/12-3/5=3/4-3/5=0,75-0,6=0,15;

3) 5/6-3/10=(5*5-3*3)/30=16/30=8/15;

4) 8/15:15/100=8*100/(15*15)=800/225= 3 125/225= 3 5/9

5) 3 5/9+1/3=3 5/9+3/9=3 8/9

ответ: 3 8/9.