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1.(1 8/13 * 13/42+5 5/7:8/21):(4 1/4-2 3/4)
2. 2 3/5:6 1/15+1 1/14-1 39/73:(5 5/7-5 1/16)

1)(1 8/13 • 13/42 + 5 5/7 : 8/21) : (8 1/8 + 3 1/2) =

= ( 21/13 • 13/42 + 40/7 : 8/21) : (65/8 + 7/2) =

= (1/2 + 15) : (65/8 + 28/8) =

= (1/2 + 30/2) : 93/8 = 31/2 : 93/8 = (31•8)/(2•93) =  

= 4/3 = 1 1/3

2)13/5:91/15=13/5*15/91=3/7;

3/7+11/14=6/14+11/14=17/14;

40/7-81/16=640/112-567/112=73/112;

112/73*73/112=1;  

17/14-1=3/14.