Question

 Tìm X:

7 chia hết cho 2x - 1

 

Answer 1

  

Answer 2

7 ⋮ (2x - 1)

⇒ 2x - 1 ∈ Ư(7) = {-7; -1; 1; 7}

⇒ 2x ∈ {-6; 0; 2; 8}

⇒ x ∈ {-3; 0; 1; 4}

Answer 3

\(7⋮2x-1\)

\(\Rightarrow\left(2x-1\right)\inƯ\left(7\right)=\left\{\pm1;\pm7\right\}\)

\(+2x-1=1\)

\(\Rightarrow x=1\)

\(+2x-1=-1\)

\(\Rightarrow x=0\)

\(+2x-1=7\)

\(\Rightarrow x=4\)

\(+2x-1=-7\)

\(\Rightarrow x=-3\)

Vậy \(x\in\left\{1;0;4;-3\right\}\)