![](https://rs.olm.vn/images/background/bg301680484589.jpg?v=2?)
![](https://rs.olm.vn/images/avt/3.png?13)
Duong Trung Khai
Giới thiệu về bản thân
Chào mừng bạn đến với trang cá nhân của Duong Trung Khai
![](https://rs.olm.vn/images/medal_mam_non.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_win_1.png)
0
![](https://rs.olm.vn/images/medal_tan_binh.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_win_1.png)
0
![](https://rs.olm.vn/images/medal_chuyen_can.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_win_1.png)
0
![](https://rs.olm.vn/images/medal_cao_thu.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_win_1.png)
0
![](https://rs.olm.vn/images/medal_thong_thai.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_win_1.png)
0
![](https://rs.olm.vn/images/medal_kien_tuong.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_win_1.png)
0
![](https://rs.olm.vn/images/medal_dai_kien_tuong.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_ngoi_sao.png)
![](https://rs.olm.vn/images/medal_win_1.png)
0
2022-06-03 10:10:58
5N = \(\dfrac{5}{1.5}\)+\(\dfrac{5}{5.10}+\dfrac{5}{10.15}+\dfrac{5}{15.20}+...+\dfrac{5}{2005.2010}\)
5N = \(\dfrac{1}{1}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{10}+\dfrac{1}{10}-\dfrac{1}{15}+...+\dfrac{1}{2005}-\dfrac{1}{2010}\)
5N=\(1-\dfrac{1}{2010}\)
5N= \(\dfrac{2009}{2010}\)
N= \(\dfrac{2009}{2010}:5\)
N=\(\dfrac{2009}{10050}\)
2022-06-03 10:06:14
2022-06-03 10:05:49
(X+15) : 3 = 24
X+15 = 24 x 3
X+15 = 72
X= 72-15
X=57