Gọi \(d=ƯCLN\left(21n+5;14n+3\right)\)
\(\Leftrightarrow\left\{{}\begin{matrix}21n+5⋮d\\14n+3⋮d\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}42n+10⋮d\\42n+9⋮d\end{matrix}\right.\Leftrightarrow d=1\)
Vậy: ƯCLN(21n+5;14n+3)=1
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