Question

Tìm x :

x+15 : x+3

Answer 1

\(x+15⋮x+3\Leftrightarrow x+3+12⋮x+3\Leftrightarrow12⋮x+3\Leftrightarrow x+3\in\text{Ư}\left(12\right)=\left\{-12;-6;-4;-3;-2;-1;1;2;3;4;6;12\right\}\)

\(\Leftrightarrow x\in\left\{-15;-9;-7;-6;-5;-4;-2;-1;0;1;3;9\right\}\)

Answer 2

x + 15 : x+ 3 

↔ x+3 + 12 : x + 3 

= 12 : x + 3 

= x + 3 ϵ Ư (12 )

= { -12; -6; -4; -3; 

Answer 3

x + 15 : x+ 3 

↔ x+3 + 12 : x + 3 

= 12 : x + 3 

= x + 3 ϵ Ư (12 )

= { -12; -6; -4; -3; -2; -1 ; 1;0;3;9}

↔ x ϵ { -15;  -9;  -7; -6; -5; -4; -2; -1; 1; 0;1; 3; 9 }