Ответ:

Пошаговое объяснение:

N 1

3/5 + 8/13 =

(3*13)/(5*13) + (8*5)/(13*5) = 39/65 + 40/65 = 79/65 =

1. 14/65

N 2

-4 + 3/4 = -3. 4/4 + 3/4 =

-3. 1/4

N 3

24 - 50 + 7/2 - 0,25 =

1) 24 - 50 = -26

2) -26 + 7/2 = -26 + 3,5 =

-22,5

3) -22,5 - 0,25 = -22,75

N 4

131 - 89 + 101 - 5/9 =

1) 131 - 89 = 42

2) 42 + 101 = 143

3) 143 - 5/9 = 142. 9/9 - 5/9 = 142. 4/9

N 5

8/3 + 7/12 - 8/6 + 0,5 =

1) 8/3 + 7/12 = 32/12 + 7/12 = 39/12

2) 39/12 - 8/6 = 39/12 - 16/12 = 23/12

3) 23/12 + 0,5 = 23/12 + 5/10 = 23/12 + 1/2 = 23/12 + 6/12 = 29/12 = 2. 5/12