在正四棱锥
中,已知
,则当该正四棱锥的体积最大时,该正四棱锥的高为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8becd8b978059483a61d333e5bfb019d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
2019高二下·全国·专题练习 查看更多[2]
更新时间:2019-05-27 17:25:26
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单选题
|
较难
(0.4)
解题方法
【推荐1】已知函数
,
,曲线
上总存在两点
,
,使曲线
在
两点处的切线互相平行,则
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae6e7174915bbdf1eb36ded2e7ff8aaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/694ef3b171338b368d9d6a2c7a068615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b29a7faa14a6e09d0db2d04f4ced03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49dd9a3bc9b01520fa2def6ebf0968c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9baea7d7c6997e182e6e029580e31440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b29a7faa14a6e09d0db2d04f4ced03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450398974b1561ca801e102e16df6789.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐2】在
中,
为
的中点,点
在线段
(不含端点)上,且满足
,若不等式
对
恒成立,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a12fbaa0616926a62117bd8687a619a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5d33cfa41f7049ea74aac52247f2e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c32a341bb7f2597378df250b93efdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐1】已知正方体
的棱长为
,
分别为棱
,
上的动点,则四面体
的体积最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9096111111cc1b47860309fd3b23f9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/5/7c6fabfd-5852-49d3-82d4-baef7ddd3e91.png?resizew=154)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,已知
是圆
的直径,
,
在圆上且分别在
的两侧,其中
,
.现将其沿
折起使得二面角
为直二面角,则下列说法不正确的是( )
![](https://img.xkw.com/dksih/QBM/2019/12/28/2364671997214720/2367259009622016/STEM/a3a8db7714c14f0a8585f4dcdd8b58be.png?resizew=153)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
![](https://img.xkw.com/dksih/QBM/2019/12/28/2364671997214720/2367259009622016/STEM/a3a8db7714c14f0a8585f4dcdd8b58be.png?resizew=153)
A.![]() ![]() ![]() ![]() |
B.当![]() ![]() ![]() |
C.![]() ![]() |
D.存在一个位置,使得平面![]() ![]() |
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