1. (1+11/2*2/5) : (2/5*1/3*2/3).2. 3/2*7/5*13/11*4/6*10/14*22/26. 3.1 53/8*4 1/6-15 3/8

1). (1 + 11/2 * 2/5) : (2/5 * 1/3 * 2/3) = 44,44.

11 : 2 = 5,5;

2 : 5 = 0,4;

5,5 * 0,4 = 2,2;

1 + 2,2 = 3,2;

1 : 3 = 0,3;

2 : 3 = 0,6;

0,4 * 0,3 = 0,12;

0,12 * 0,6 = 0,072;

3,2 : 0,072 = 44,44.

2). 3/2 * 7/5 * 13/11 * 4/6 * 10/14 * 22/26 = 0,88.

3 : 2 = 1,5;

7 : 5 = 1,4;

13 : 11 = 1,18;

4 : 6 = 0,6;

10 : 14 = 0,71;

22 : 26 = 0,84;

1,5 * 1,4 = 2,1;

2,1 * 1,18 = 2,47;

2,47 * 0,6 = 1,48;

1,48 * 0,71 = 1,055;

1,055 * 0,84 = 0,88.

3). 1 53/8 * 4 1/6 - 15 3/8 = - 8,615.

53 : 8 = 6,625;

6,625 + 1 = 1,625;

1 : 6 = 0,16;

0,16 + 4 = 4,16;

3 : 8 = 0,375;

0,375 + 15 = 15,375;

1,625 * 4, 16 = 6,76;

6,76 - 15,375 = - 8,615.