Question

Tìm x ∈ N thỏa mãn

Answer 1

\(\Rightarrow10x+6⋮2x-1\\ \Rightarrow5\left(2x-1\right)+11⋮2x-1\\ \Rightarrow2x-1\inƯ\left(11\right)=\left\{1;11\right\}\\ \Rightarrow x\in\left\{1;6\right\}\)

Answer 2

\(\Leftrightarrow10x+6⋮2x-1\)

\(\Leftrightarrow2x-1\in\left\{1;-1;11;-11\right\}\)

\(\Leftrightarrow2x\in\left\{2;0;12\right\}\)

hay \(x\in\left\{1;0;6\right\}\)