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【简答题】
在直角坐标系xOy中，曲线C 1 的点均在C 2 ：（x-5） 2 ＋y 2 =9外，且对C 1 上任意一点M，M到直线x=﹣2的距离等于该点与圆C 2 上点的距离的最小值. （Ⅰ）求曲线C 1 的方程； (1-4班做)（Ⅱ）设P(x 0 ,y 0 )（y 0 ≠±3）为圆C 2 外一点，过P作圆C 2 的两条切线，分别与曲线C 1 相交于点A，B和C，D.证明：当P在直线x=﹣4上运动时，四点A，B，C，D的纵坐标之积为定值. （5-7班做）（Ⅱ）设P(-4,1)为圆C 2 外一点，过P作圆C 2 的两条切线，分别与曲线C 1 相交于点A，B和C，D.证明：四点A，B，C，D的纵坐标之积为定值.
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