$解:如圖,∵M(jìn)(1,?1)$
$∴兩條對(duì)稱軸分別為直線x=1和直線y=?1$
$點(diǎn)P(4,n),Q(4,n+1)關(guān)于直線x=1的對(duì)稱點(diǎn)分別為$
$P_{1}(?2,n),Q_{1}(?2,n+1),點(diǎn)P_{1}(?2,n),Q_{1}(?2,n+1)$
$關(guān)于直線y=?1的對(duì)稱點(diǎn)分別為P_{2}(?2,?2?n),Q_{2}(?2,?3?n)$
$P_{2}Q_{2}在直線x=?2上,若P_{2}Q_{2}位于△ABC內(nèi)部,則需要滿足$
$\begin{cases}{ -2-n\lt 3} \\ { -3-n\gt 1} \end{cases}$
$∴-5\lt n\lt -4$
