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#a1233720-95d9-4779-aaff-08f797924248简单填空题双曲线直线与圆+圆锥曲线

1. 已知点M(5,0)M(-\sqrt{5},0)N(5,0)N(\sqrt{5},0),动点PP满足条件PMPN=4\vert PM\vert -\vert PN\vert =4.则动点PP的轨迹方程为((  ))