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【简答题】
设P( a , b )（ b ≠0）是平面直角坐标系 x O y 中的点， l 是经过原点与点(1, b )的直线，记Q是直线 l 与抛物线 x 2 ＝2 py （ p ≠0）的异于原点的交点 ⑴.已知 a ＝1， b ＝2， p ＝2，求点Q的坐标。 ⑵.已知点P( a , b )（ ab ≠0）在椭圆+ y 2 ＝1上， p ＝，求证：点Q落在双曲线4 x 2 －4 y 2 ＝1上。 ⑶.已知动点P( a , b )满足 ab ≠0， p ＝，若点Q始终落在一条关于 x 轴对称的抛物线上，试问动点P的轨迹落在哪种二次曲线上，并说明理由。
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