1) 4 1/5: 7/15: 1/3= 2) 4 1/5: (7/15: 1/3)= 3) (5 8/9: 1 17/36+1 1/4): 4 1/5= 4) (2 1/4+4 5/6): 3 2/5-3/4: 3/5=

1) 21/5 *15/7 *3/1=9*3=27
2)21/5 /(7/15*3/1)=21/5*5/7=3
3) (53/9*36/53 + 5/4):21/5=(4+5/4) :21/5= 21/4 *5/21=5/4=1 1/4
4) (9/4+29/6) *5/17 - 3/4 *5/3= 85/12*5/17-5/4=25/12-5/4= 25-15/12=10/12=5/6