Вычисли удобным способом 8+7-9 5+6-8 13-5+4. 14-6+2. 5 + (16-8) 7 + (15-9)

1). 8 + 7 - 9:

8 + 7 = 15;

15 - 9 = 6.

8 + 7 - 9 = 6.

2). 5 + 6 - 8:

5 + 6 = 11;

11 - 8 = 3.

5 + 6 - 8 = 3.

3). 13 - 5 + 4:

13 - 5 = 8;

8 + 4 = 12.

13 - 5 + 4 = 12.

4). 14 - 6 + 2:

14 - 6 = 8;

8 + 2 = 10.

14 - 6 + 2 = 10.

5). 5 + (16 - 8):

16 - 8 = 8;

5 + 8 = 13.

5 + (16 - 8) = 13.

6). 7 + (15 - 9):

15 - 9 = 6;

7 + 6 = 13.

7 + (15 - 9) = 13.