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【简答题】
在平面直角坐标系xoy中,给定三点 ,点P到直线BC的距离是该点到直线AB,AC距离的等比中项。(Ⅰ)求点P的轨迹方程;(Ⅱ)若直线L经过 的内心(设为D),且与P点的轨迹恰好有3个公共点,求L的斜率k的取值范围。
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