1 3 2 4
(5 5/9-6,8):(2 13/30-2 1/12)*3,6=12 4/5
1) 5 5/9-6,8=50/9-6 8/10=50/9-6 4/5=50/9-34/5=250/45-306/45= -56/45
2) 2 13/30-2 1/12=13/30-1/12=26/60-5/60=21/60
3) (-56/45):21/60= -(56/45*60/21)=-(8/3*4/3)= -32/9
4)(-32/9)*3,6=(-32,9)*3 6/10=(-32/9)*3 3/5= -(32/9*18/5)= -64/5= 12 4/5