1 . 如图,在正四棱锥
中,
,
,动点
,
分别在线段
,
上,且满足
,现给出下列结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/4b6dde4d-069f-47ef-ac4c-34a45943be31.png?resizew=160)
①四棱锥
的体积不变;
②平面
平面
;
③三棱锥
体积的最大值为
;
④三角形
可能是锐角三角形.
其中正确结论的序号为______ .(写出所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd3eb538f36e6e722e4ce125266b99b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/986a41e3ae80e591e3efeb97a59555e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/4b6dde4d-069f-47ef-ac4c-34a45943be31.png?resizew=160)
①四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75764c506b7ff847a7960ed28371f49b.png)
②平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f020ca4ad44801691235958e253907d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
③三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abb4114ae425d31ea6b554b328163a14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
④三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
其中正确结论的序号为
您最近一年使用:0次
2 . 三棱锥
的各顶点都在同一球面上,
底面
,若
,
,且
,给出如下命题:
①
是直角三角形;②此球的表面积等于
;
③
平面
;④三棱锥
的体积为
.
其中正确命题的序号为______ .(写出所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f6604b5ed7a24d6006f36a9c43a5ada.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b0bdd96b2f60ae5565bed63225f5c5.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf9718967af7a01c5b4866ea6f73bbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
其中正确命题的序号为
您最近一年使用:0次
解题方法
3 . 如图,在正方体
中,点
在棱
上,且
,
是线段
上一动点,现给出下列结论:①
;②存在一点
,使得
;③三棱锥
的体积与点
的位置无关.其中所有正确结论的序号为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa9da63f296868a0cae027368735fa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a2860a4524d02690fd2949d93e39c92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aaf9fbafc94c804aee3b2c025e87154.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/b66ab3c8-07dd-4a8a-b486-254ae87eb4d6.png?resizew=170)
您最近一年使用:0次
2021-01-20更新
|
328次组卷
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