Ta có:

\(\frac{2n+1}{n-1}=\frac{2n-2+3}{n-1}=\frac{2\left(n-1\right)+3}{n-1}=2+\frac{3}{n-1}\)

Để (2n+1) chia hết cho (n-1) thì \(\frac{3}{n-1}\)phải có GTN

\(\Rightarrow\)3 chia hết cho n-1

\(\Rightarrow n-1\inƯ\left(3\right)\Rightarrow n-1\in\left\{1;3\right\}\Rightarrow n\in\left\{2;4\right\}\)

1. Where are you going to stay?

2. How is the weather?

tuổi ông hơn cháu

kiển tố là tổ kiến

1. This is his first role. Nevertheless, his acting is very excellent.

2. Despite not receiving good investment, the film was a great success.

3. Although it is a horror film,....

4. Although the story of the film wasn't good,....

5. Although I don't like, I agree....

6. He was made to study hard for his exam.

7. In spite of her success, she felt dissatisfied.

8. The snow was so heavy that we couldn't arrive home early.

9. Even though I've taken the pill, I'm no better.