Решите пример 6 класс​

041158: как ответить

041158: - 1
2
+ 2
5
= 2
5
- 1
2
= 2·2
5·2
- 1·5
2·5
= 4
10
- 5
10
= 4 - 5
10
= - 1
10
= -0.1

4.8 - 6.9= - (6.9 - 4.8) = - 2.1

- 1
10
+ (-2.1) = - 1
10
- 2.1 = - 1
10
- 2 1
10
= - 2 - 1
10
- 1
10
= - 2 - 1 + 1
10
= - 2 - 2
10
= - 2 - 1 · 2
5 · 2
= - 2 - - 1
5
= -2 1
5
= -2.2

-2 1
5
- (-1.2) = -2 1
5
+ 1.2 = -2 1
5
+ 1 2
10
= 1 2
10
- 2 1
5
= 2 + 1·10
10
- 1 + 2·5
5
= 12
10
- 11
5
= 12·1
10·1
- 11·2
5·2
= 12
10
- 22
10
= 12 - 22
10
= - 10
10
= - 1 = -1