1). (2 целых 5/16 - 3/4) + (6 целых 1/2 - 2 целых 13/16) 2. (9 целых 5/12 - 3целых 8/15) - (3целых 5/12 - 1 целая 11/18)

а) (2 5/16 - 3/4) + (6 1/2 - 2 13/16) = 5 1/4 = 5,25;

Первое действие.

2 5/16 - 3/4 = 37/16 - 3/4 = 37/16 - 12/16 = (37 - 12)/16 = 25/16 = 1 9/16;

Второе действие.

6 1/2 - 2 13/16 = 13/2 - 45/16 = 104/16 - 45/16 = (104 - 45)/16 = 59/16 = 3 11/16;

Третье действие.

1 9/16 + 3 11/16 = 25/16 + 59/16 = (25 + 59)/16 = 84/16 = 5 4/16 = 5 1/4 = 5,25; 

б) (9 5/12 - 3 8/15) - (3 5/12 - 1 11/18) = 4 7/90;

1) 9 5/12 - 3 8/15 = 113/12 - 53/15 = 565/60 - 212/60 = (565 - 212)/60 = 353/60 = 5 53/60;

2) 3 5/12 - 1 11/18 = 41/12 - 29/18 = 123/36 - 58/36 = (123 - 58)/36 = 65/36 = 1 29/36;

3) 5 53/60- 1 29/36 = 353/60 - 65/36 = 1059/180 - 325/180 = (1059 - 325)/180 = 

= 734/180 = 4 14/180 = 4 7/90; 

в) 4 7/32 + (1 5/24 + 9/32) + (1 1/2 + 3 7/24) = 10 1/2 = 10,5;

1) 1 5/24 + 9/32 = 29/24 + 9/32 = 116/96 + 27/96 = 143/96 = 1 47/96;

2) 1 1/2 + 3 7/24 = 3/2 + 79/24 = 36/24 + 79/24 = 115/24 = 4 19/24;

3) 4 7/32 + 1 47/96 = 135/32 + 143/96 = 405/96 + 143/96 = 548/96 = 5 68/96 = 5 17/24;

4) 5 17/24 + 4 19/24 = 137/24 + 115/24 = 252/24 = 10 12/24 = 10 1/2 = 10,5;