已知椭圆x2/4+y2=1的焦点为F1,F2,点P为椭圆上一动点,当∠F1PF2为钝角时,求点P的横坐标的取值范围.题目其实是这样的:
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![已知椭圆x2/4+y2=1的焦点为F1,F2,点P为椭圆上一动点,当∠F1PF2为钝角时,求点P的横坐标的取值范围.题目其实是这样的:](/uploads/image/z/5263526-38-6.jpg?t=%E5%B7%B2%E7%9F%A5%E6%A4%AD%E5%9C%86x2%2F4%2By2%3D1%E7%9A%84%E7%84%A6%E7%82%B9%E4%B8%BAF1%2CF2%2C%E7%82%B9P%E4%B8%BA%E6%A4%AD%E5%9C%86%E4%B8%8A%E4%B8%80%E5%8A%A8%E7%82%B9%2C%E5%BD%93%E2%88%A0F1PF2%E4%B8%BA%E9%92%9D%E8%A7%92%E6%97%B6%2C%E6%B1%82%E7%82%B9P%E7%9A%84%E6%A8%AA%E5%9D%90%E6%A0%87%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4.%E9%A2%98%E7%9B%AE%E5%85%B6%E5%AE%9E%E6%98%AF%E8%BF%99%E6%A0%B7%E7%9A%84%EF%BC%9A)
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