在四面体ABCD中,
,
,
,若四面体
的体积为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915e8e775538d41debf1933102c6b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c90da0cd2708481057fe19acebf2ec7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a93410ebb53f2d76a5a077fdd3836b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e4e1cf88cd39a97137e84721894925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a8b76e36783a69d14ec54af82c7df0.png)
A.二面角![]() ![]() |
B.二面角![]() ![]() |
C.AC的长可能为2 |
D.AC的长可能为![]() |
更新时间:2023-12-16 16:49:14
|
相似题推荐
多选题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,正三棱锥
和正三棱锥
的侧棱长均为
,
.若将正三棱锥
绕
旋转,使得点
分别旋转至点
处,且
四点共面,点
分别位于
两侧,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/1/10b6472e-d579-47dc-9207-1c98e464856b.png?resizew=137)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf9718967af7a01c5b4866ea6f73bbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f2d2ef6661d1808fed0cbd1b0fa53d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf9718967af7a01c5b4866ea6f73bbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff571c72c041d8668b4d2754679f64d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de83ce4d5ad4bb47d74cbd3bc3394ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e5d9f7e63d80a1969318ac999a3e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e925a4d4d706168d1ae69167483096c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/1/10b6472e-d579-47dc-9207-1c98e464856b.png?resizew=137)
A.![]() |
B.![]() ![]() |
C.二面角![]() ![]() |
D.多面体![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
【推荐2】在四边形ABCD中,
,
,
,
,将
沿BD折起,使平面
平面BCD,构成三棱锥
,则在三棱锥
中,下列命题错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386c7de62e8f9a8161ebaefe6b4ec35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
A.平面![]() | B.平面![]() |
C.平面![]() | D.平面![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
解题方法
【推荐1】如图,正方体ABCD-A1B1C1D1的棱长为1,P是
上的一动点,则下列选项正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/071488e3-56bc-4367-9d6e-6e75a8bada2c.png?resizew=212)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/071488e3-56bc-4367-9d6e-6e75a8bada2c.png?resizew=212)
A.P在直线BA1上运动时,三棱锥A-D1PC的体积不变; |
B.![]() ![]() |
C.三棱锥A1-ABD的外接球表面积为3π |
D.![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,在边长为
的正方体
中,点
在底面正方形
内运动,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/462f09c9-4400-4617-99b9-3e4f061ea226.png?resizew=212)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/462f09c9-4400-4617-99b9-3e4f061ea226.png?resizew=212)
A.存在点![]() ![]() ![]() |
B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
【推荐3】在棱长为1的正方体
中,
,
是线段
(含端点)上的一动点,则下列命题中正确的是( ).
![](https://img.xkw.com/dksih/QBM/2021/12/4/2865432819294208/2868164810784768/STEM/8bfe6a3b-d8f2-4696-adfd-25b914f0bc83.png?resizew=188)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a23f01af749100e1888bba06268843db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/2021/12/4/2865432819294208/2868164810784768/STEM/8bfe6a3b-d8f2-4696-adfd-25b914f0bc83.png?resizew=188)
A.![]() | B.当![]() ![]() ![]() |
C.三棱锥![]() ![]() | D.![]() ![]() ![]() |
您最近一年使用:0次