Gọi \(d=ƯCLN\left(7n+10;2n+3\right)\left(d\in N\right)\)
\(\Leftrightarrow\left\{{}\begin{matrix}7n+10⋮d\\2n+3⋮d\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}14n+20⋮d\\14n+21⋮d\end{matrix}\right.\)
\(\Leftrightarrow1⋮d\)
\(\Leftrightarrow d=1\)
\(\LeftrightarrowƯCLN\left(7n+10;2n+3\right)=1\)
\(\Leftrightarrow\dfrac{7n+10}{2n+3}\) tối giản