三棱锥
中,已知
,点
是
的重心,且
,则
的最小值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37716278f11a6e29af45f882bbb9ce34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a751b9dd45341517fb9d262d990a25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f94f5d7a1c644f19fa7bbe8c6e154b.png)
A.2 | B.![]() | C.![]() | D.![]() |
更新时间:2016-12-05 00:33:56
|
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解题方法
【推荐1】已知
恒成立,若
为真命题,则实数
的最小值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c2b26b6579f1dd9875d2f24e943f45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.2 | B.3 | C.4 | D.5 |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
解题方法
【推荐3】已知
,
,若
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/536178538dd8176b8743e3ceb94523a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f008cea432b68934066d32243ccf69bf.png)
A.7 | B.9 | C.11 | D.13 |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,已知空间四边形
,M,N分别是边OA,BC的中点,点
满足
,设
,
,
,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/5d6fc44b-7ba1-44d3-b03b-5c60847745fc.png?resizew=159)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9ceae23b51a9407f9962b6328722f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/420ad6159fc091d6a5ffddf0676d2662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cd14dfc0024459f9d8e594c95c5106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40f8ef7e3af00c41f85a20578afdb57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f701bd8ed66d3f4d3304b8cd62e9dec0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/5d6fc44b-7ba1-44d3-b03b-5c60847745fc.png?resizew=159)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
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适中
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名校
【推荐2】如图,已知四棱柱
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( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/c2ca923d-6a94-4be1-a4ea-fbdb27f0aaf4.png?resizew=164)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27d75aafc71e0714f2db78702b953368.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/c2ca923d-6a94-4be1-a4ea-fbdb27f0aaf4.png?resizew=164)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次