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【简答题】
已知F 1 ,F 2 分别为椭圆C 1 : (a>b>0)的上下焦点,其中F 1 也是抛物线C 2 :x 2 =4y的焦点,点M是C 1 与C 2 在第二象限的交点,且 (1) 求椭圆C 1 的方程; (2) 已知点P(1,3)和圆O:x 2 +y 2 =b 2 ,过点P的动直线l与圆O相交于不同的两点A,B,在线段AB上取一点Q,满足 ,λ≠0且λ≠±1。求证:点Q总在某定直线上。
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