Question

giúp câu này ạ

Answer 1

\(2x+7⋮x+3\Rightarrow2x+6+1⋮x+3\)

\(\Rightarrow2\left(x+3\right)+1⋮x+3\)

\(\Rightarrow1⋮x+3\)

\(\Rightarrow x+3=Ư\left(1\right)=\left\{-1;1\right\}\)

\(\Rightarrow x=\left\{-4;-2\right\}\)

Answer 2

2x+7⋮x+3⇒2x+6+1⋮x+32�+7⋮�+3⇒2�+6+1⋮�+3

⇒2(x+3)+1⋮x+3⇒2(�+3)+1⋮�+3

⇒1⋮x+3⇒1⋮�+3

⇒x+3=Ư(1)={−1;1}⇒�+3=Ư(1)={−1;1}