Câu hỏi của vvvvvvvv

Question

tìm số nguyên n để 2n+1 chia hết cho n+2

Nguyễn Việt Lâm · Accepted Answer

Để $2n+1=2\left(n+2\right)-3⋮n+2$

$\Rightarrow3⋮n+2$

$\Rightarrow n+2=Ư\left(3\right)=\left\{-3;-1;1;3\right\}$

$\Rightarrow n=\left\{-1;1;3;5\right\}$Câu trả lời: Để $2n+1=2\left(n+2\right)-3⋮n+2$

$\Rightarrow3⋮n+2$

$\Rightarrow n+2=Ư\left(3\right)=\left\{-3;-1;1;3\right\}$

$\Rightarrow n=\left\{-1;1;3;5\right\}$

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