Question

Tìm x là số tự nhiên biết: x+7 chia hết cho x+2

Answer 1

\(\frac{x+7}{x+2}=\frac{x+2+5}{x+2}=1+\frac{5}{x+2}.\)

Để \(x+7⋮x+2\Rightarrow5⋮x+2\Rightarrow x+2=\left\{-5;-1;1;5\right\}\)

\(\Rightarrow x\left\{-7;-3;-1;3\right\}\)

Answer 2

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