Question

(2n + 3) chia hết cho n

tìm số tn n 

Answer 1

N=1 hoặc 3

Answer 2

\(\left(2n+3\right)⋮n\Rightarrow3⋮n\Rightarrow n\inƯ\left(3\right)=\left\{1;-1;3;-3\right\}\)

Do \(n\in N\)

\(\Rightarrow n\in\left\{1;3\right\}\)

Answer 3

Ta có \(\left(2n+3\right)⋮n\) mà \(2n⋮n\) \(\Rightarrow3⋮n\) \(\Rightarrow n\inƯ\left(3\right)\)

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

mà \(n\in N\Rightarrow n\in\left\{1;3\right\}\)

 

Answer 4

Ta có: \(2n+3⋮n\)

\(\Leftrightarrow3⋮n\)

hay \(n\in\left\{1;-1;3;-3\right\}\)