解一道椭圆题.椭圆x²/9+y²/4=1的焦点F1,F2,点P为其上的动点,当∠F1PF2为钝角时,点P横坐标的取值范围是
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![解一道椭圆题.椭圆x²/9+y²/4=1的焦点F1,F2,点P为其上的动点,当∠F1PF2为钝角时,点P横坐标的取值范围是](/uploads/image/z/12408072-24-2.jpg?t=%E8%A7%A3%E4%B8%80%E9%81%93%E6%A4%AD%E5%9C%86%E9%A2%98.%E6%A4%AD%E5%9C%86x%26sup2%3B%2F9%2By%26sup2%3B%2F4%3D1%E7%9A%84%E7%84%A6%E7%82%B9F1%2CF2%2C%E7%82%B9P%E4%B8%BA%E5%85%B6%E4%B8%8A%E7%9A%84%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%E7%82%B9P%E6%A8%AA%E5%9D%90%E6%A0%87%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E6%98%AF)
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