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Пошаговое объяснение:

2 1/2 * 48 - 3 2/3 : 1/18 + 5 3/12 : 7/36 = 81

1) 2 1/2 * 48 = 5/2 * 48/1 = 5/1 * 24/1 = 120

2) 3 2/3 : 1/18 = 11/3 * 18/1 = 11/1 * 6/1 = 66

3) 5 3/12 : 7/36 = 63/12 * 36/7 = 9/1 * 3/1 = 27

4) 120 - 66 = 54

5) 54 + 27 = 81

13 1/2 : 1 1/3 + 16 1/2 * 1 5/11 + 19 1/4 : 4/25 = 154 7/16

1) 13 1/2 : 1 1/3 = 27/2 : 4/3 = 27/2 * 3/4 = 81/8 = 10 1/8

2) 16 1/2 * 1 5/11 = 33/2 * 16/11 = 3/1 * 8/1 = 24

3) 19 1/4 : 4/25 = 77/4 * 25/4 = 1925/16 = 120 5/16

4) 10 1/8 + 24 = 34 1/8

5) 34 1/8 + 120 5/16 = 34 2/16 + 120 5/16 = 154 7/16

(3 1/2 - 2 2/3 + 5 5/6 + 4 3/5) * 24 = 270 2/5

1) 3 1/2 - 2 2/3 = 3 3/6 - 2 4/6 = 2 9/6 - 2 4/6 = 5/6

2) 5/6 + 5 5/6 = 5 10/6 = 6 4/6 = 6 2/3

3) 6 2/3 + 4 3/5 = 6 10/15 + 4 9/15 = 10 19/15 = 11 4/15

4) 11 4/15 * 24 = 169/15 * 24/1 = 169/5 * 8/1 = 1352/5 = 270 2/5

48 3/5 : 6 3/4 * 5/12 - 2 5/6 + 1 75/94 * (1 1/2 * 1/3 - 13 : 26) = - 1/3

1) 1 1/2 * 1/3 = 3/2 * 1/3 = 1/2

2) 13 : 26 = 13/26 = 1/2

3) 1/2 - 1/2 = 0

4) 48 3/5 : 6 3/4 = 243/5 : 27/4 = 243/5 * 4/27 = 9/5 * 4/1 = 36/5 = 7 1/5

5) 7 1/5 * 5/12 = 36/6 * 5/12 = 3/6 * 5/1 = 15/6 = 2 3/6 = 2 1/2

6) 1 75/94 * 0 = 0

7) 2 1/2 - 2 5/6 = 2 3/6 - 2 5/6 = 15/6 - 17/6 = - 2/6 = - 1/3

8) - 1/3 + 0 = - 1/3