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	20/09/2025 20:12:39
	Toán học - Lớp 7 \| Toán học \| Lớp 7

``` e) 1 3 5 7 9 11 13 11 9 7 5 3 1 --- + --- + --- + --- - --- + --- + --- - --- + --- + --- + --- + --- + --- + --- 3 5 7 9 11 13 15 13 11 9 7 5 3 1 f) 1 1 1 1 --- - --- - --- - ... 2014 2014.2013 2013.2012 3.2 2.1 ```

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----- Nội dung ảnh -----
```
e)
1 3 5 7 9 11 13 11 9 7 5 3 1
--- + --- + --- + --- - --- + --- + --- - --- + --- + --- + --- + --- + --- + ---
3 5 7 9 11 13 15 13 11 9 7 5 3 1

f)
1 1 1 1
--- - --- - --- - ...
2014 2014.2013 2013.2012 3.2 2.1
```