50. Вычислите:
2 - 0, 26 ) 30 (1)
5
+ 0, 25
6
72
51
:0, 9
5
- 1
7
1215
83

=3

Пошаговое объяснение:

1) 5/6 + 0,25 = 5/6 + 1/4 = 10/12 + 3/12 = 13/12

2) 4 1/3 : 13/12 = 13/3 * 12/13 = 4

3) 7/12 - 2/15 = 35/60 - 8/60 = 27/60 = 9/20

4) 9/20 : 0,9 = 9/20 : 9/10 = 9/20 * 10/9 = 1/2 = 0,5

5) 4 : 0,5 = 8

6) 7/12 + 1/9 = 21/36 + 4/36 = 25/36

7) 3,6 * 25/36 = 36/10 * 25/36 = 5/2 = 2,5

8) 5/8 - 1/3 = 15/24 - 8/24 = 7/24

9) 7/24 * 1 5/7 = 7/24 * 12/7 = 1/2 = 0,5

10) 2,5 : 0,5 = 5

11) 8 - 5 = 3