Question

tìm x

13+x chia hết cho x

3x+10 chia hết cho x

ai nhanh mik tick

Answer 1

13 + x \(⋮\) x

Mà x chia hết cho x

 => 13 chia hết cho x

=> x \(\in\) Ư( 13 )

\(\Rightarrow x\in\left\{\pm1;\pm13\right\}\)

Answer 2

\(3x+10⋮x\) 

Mà   \(x⋮x\)

\(\Rightarrow3x⋮x\)

\(\Rightarrow10⋮x\)

\(\Rightarrow x\inƯ\left(10\right)\)

\(\Rightarrow x\in\left\{\pm1;\pm2;\pm5;\pm10\right\}\)