Question

Tìm x:

(x + 13) chia hết cho (x - 1)

Hỏi x = ?

Mình cần gấp lắm !

Đến T6 phải nộp rồi.

Answer 1

\(\left(x+13\right)⋮\left(x-1\right)\)

\(\Rightarrow\left(x-1\right)+14⋮\left(x-1\right)\)

\(\Rightarrow\left(x-1\right)\inƯ\left(14\right)=\left\{-14;-7;-2;-1;1;2;7;14\right\}\)

\(\Rightarrow x\in\left\{-13;-6;-1;0;2;3;8;15\right\}\)

Answer 2

\(x+13⋮x-1\)

\(\Leftrightarrow x-1\in\left\{1;-1;2;-2;7;-7;14;-14\right\}\)

hay \(x\in\left\{2;0;3;-1;8;-6;15;-13\right\}\)