椭圆上有两点P、Q ,O为原点,若OP、OQ斜率之积为,则 为          

椭圆上有两点P、Q ,O为原点,若OP、OQ斜率之积为,则 为                                                    (      )

   A .  4         B.   64           C.  20      D.  不确定  

答案

答案: C


解析:

解析: 设直线方程为 ,解出,写出

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