Question

tìm số nguyên x sao cho : 2 . x + 3 chia hết cho 2 - x 

Answer 1

\(\Leftrightarrow2x-4+7⋮x-2\)

\(\Leftrightarrow x-2\in\left\{1;-1;7;-7\right\}\)

hay \(x\in\left\{3;1;9;-5\right\}\)