Ta có:

\(\frac{18}{19}< 1< \frac{19}{18}\)

=> \(\frac{18}{19}< \frac{19}{18}\)

\(A=\frac{3n-5}{n+4}=\frac{3n+12-17}{n+4}=\frac{3.\left(n+4\right)-17}{n+4}=\frac{3.\left(n+4\right)}{n+4}-\frac{17}{n+4}=3-\frac{17}{n+4}\)

Để A nguyên thì \(\frac{17}{n+4}\)nguyên

=> 17 chia hết cho n + 4

=> \(n+4\inƯ\left(17\right)\)

=> \(n+4\in\left\{1;-1;17;-17\right\}\)

=> \(n\in\left\{-3;-5;13;-21\right\}\)

1. In Hanoi, northern Vietnam.

2. The temple was built in 1070 at the time of Emperor Lý Thánh Tông.

3. There are five.

4. The second one.

5. It is the symbol of Hanoi

1. In Hanoi, northern Vietnam.

2. he temple was built in 1070 at the time of Emperor Lý Thánh Tông.

3. There are five.

4. The second one.