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【简答题】
已知点P（x，y）与点 A(- 2 ，0)，B( 2 ，0) 连线的斜率之积为1，点C的坐标为（1，0）． （Ⅰ）求点P的轨迹方程； （Ⅱ）过点Q（2，0）的直线与点P的轨迹交于E、F两点，求证 CE ? CF 为常数．
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