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过定点的直线切线的交点在定直线上
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过焦点的弦的切线的交点在定直线上
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蒙日圆
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一道一元二次不等式能成立问题
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阿波罗尼斯圆
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关于直线与双曲线交点位置问题
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过任意一点做双曲线的切线条数
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抛物线与手电筒（升级版）
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椭圆的聚光（升级版）
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双曲线的散光效果（升级版）
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点的轨迹为椭圆
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点的轨迹为圆4
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