2. (5 points) Define $a^{*} b=a \times b+a-2 b$, if $3^{*} m=17$, then $m=$
【Solution】Solve: $3^{*} m=17$
$$
\begin{aligned}
3 m+3-2 m & =17 \\
m+3 & =17 \\
m & =14
\end{aligned}
$$

Therefore, the answer is: 14 .