在△ABC中,
,点D在边BC上,
,若△ABC的面积为
,则AD的最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819c7a62f0c3f64f53370d19db912c13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65b4ac8c6590141e03dfeb2e6fe3cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
更新时间:2023-04-14 19:45:17
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【推荐1】阿波罗尼斯(古希腊数学家,约公元前262-190年)的著作《圆锥曲线论》是古代世界光辉的科学成果,它将圆锥曲线的性质网罗殆尽几乎使后人没有插足的余地.他证明过这样一个命题:平面内与两定点距离的比为常数k(
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【推荐2】在
中,
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面积的最大值为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/400069fb5d629f199659cd93f758c986.png)
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【推荐1】直线x=1与抛物线C:y2=4x交于M,N两点,点P是抛物线C准线上的一点,记
=
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(1)当
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(2)给出下列命题:
①
,△PMN不是等边三角形;
②
,使得
与
垂直;
③无论点P在准线上如何运动,
总成立.
其中,所有正确命题的序号是___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc1f16636b1898590a6dce4a51042586.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dd42f780c2a802ec023ca445d193a5e.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc1f16636b1898590a6dce4a51042586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88cbe3c7ef431319901772e0f56e6750.png)
(2)给出下列命题:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36352763d69d4e90adb947cc4faae0ab.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9181b225b6ca92d8637b77e418d4b6ca.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88cbe3c7ef431319901772e0f56e6750.png)
③无论点P在准线上如何运动,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbd94f473ca76c7cca0fbe3d1ed94ba.png)
其中,所有正确命题的序号是
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解题方法
【推荐2】已知
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【推荐1】设
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【推荐2】若实数a、b、c满足
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