Question

[Hà Thu Nguyễn]

Bài 1 : Tìm x :

13 chia hết cho x-3 ( với x thuộc Z )

Answer 1

[Trần Thiên Kim]

\(13⋮\left(x-3\right)\Rightarrow\left(x-3\right)\inƯ\left(13\right)=\left\{1;-1;13;-13\right\}\)

• \(x-3=1\Rightarrow x=4\)
• \(x-3=-1\Rightarrow x=2\)
• \(x-3=13\Rightarrow x=16\)
• \(x-3=-13\Rightarrow x=-10\)​

\(\Rightarrow x\in\left\{4;2;16;-10\right\}\)