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=1的上、下顶点分别为A、B,点P在椭圆C上且异于点A、B,直线AP、BP与直线l:y=-2分别交于点M、N;(I)设直线AP、BP的斜率分别为k1,k2求证:k1•k2为定值;(Ⅱ)求线段MN长的最小值;(Ⅲ)当点P运动时,以MN为直径的圆是否经过某定点?请证明你的结论....