45. Given the three exterior angles $\alpha, \beta, \gamma$ of a triangle satisfy $\left\{\begin{array}{l}2 \alpha+3 \beta=4 \gamma \\ \alpha=4 \beta-\gamma\end{array}\right.$, then the ratio of the sizes of the three interior angles corresponding to $\alpha, \beta, \gamma$ is $\qquad$ : $\qquad$
$\qquad$
Reference answer: $2,9,4$