解题方法
1 . 已知正四棱柱
的底边长为2,侧棱
.P为底面
上的动点,给出下列四个结论:
①若
,则满足条件的P点只有两个
②若
,则点P的轨迹是一段圆弧
③若
平面
,则DP长的最小值为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
④若
,则点P在线段
上
其中所有正确的结论序号为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1a56baf43ffdf67bc8460856e31fec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f29c3e772e56008790298824122792.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9dc66318fd5ead9239e918dc29d83a.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94b69081ba8e55a60b9e673b0e1e11b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13cfdc6224181d44e63aab43ddaf07ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4cd8ba7eb52e38857830162e770f534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
其中所有正确的结论序号为
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