已知正方体
的棱长为
是侧面
内任一点,则下列结论中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/f95dbd67-9ea1-4200-a8ce-acf21c784d5d.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f31a9a7ed32e6b4d3410ae2a4620466a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/f95dbd67-9ea1-4200-a8ce-acf21c784d5d.png?resizew=148)
A.若![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() ![]() |
更新时间:2023-12-30 20:01:42
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【推荐1】在三棱锥
中,
.记二面角
、
、
的大小分别为
、
、
,V为三棱锥
的体积,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e54d5d705db6825f987cb2dbf11702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a4bddf1ea3c5d37f2233a4821909e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850319b7098a23b859791d7da3e63e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a438393ddfc7da1804baf4932442bb35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20f37e376b5392f51bb95aff3eaaa99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/104b5a3aca3b79e21a579de54e96c744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc663d6d89b3d2ccea5d63849b9e20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
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解题方法
【推荐2】已知正方体
的棱长为
为底面
对角线的交点,
是侧面
内的动点(包括边界),如图所示,若
始终成立,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0342946a0f827001a879cad686d1cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f25f0af4c0d562bcffd9804e9e09b00.png)
A.点![]() ![]() |
B.动点![]() ![]() ![]() |
C.向量![]() ![]() ![]() |
D.三棱锥![]() ![]() |
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【推荐3】如图1,在等腰梯形
中,
,
,
,
为
中点,将
沿
折起,使
点到达
的位置(点
不在平面
内),连结
,
(如图2),则在翻折过程中,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edba78154f762c0b636754c88cf90b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a466276f3b4a9a59addcaa6f68b6a850.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
A.![]() ![]() |
B.![]() |
C.存在某个位置,使![]() ![]() |
D.![]() ![]() ![]() |
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【推荐1】如图,已知正方体
的棱长为2,P,Q分别是
和底面ABCD上的动点(包含边界),且
,PQ的中点为M,则下列说法正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/ca8dc9a1-f38e-4190-b89b-377132ca0453.png?resizew=159)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9e3f3f09715fd737324ea48c3696485.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/ca8dc9a1-f38e-4190-b89b-377132ca0453.png?resizew=159)
A.点M的轨迹的面积为![]() |
B.直线![]() ![]() |
C.当![]() ![]() |
D.![]() ![]() |
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【推荐2】如图,正方体
的棱长为2,点M是其侧面
上的一个动点(含边界),点P是线段
上的动点,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/7700bbff-57be-481a-bc0b-c31453f83776.png?resizew=151)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/7700bbff-57be-481a-bc0b-c31453f83776.png?resizew=151)
A.存在点P,M,使得平面![]() ![]() |
B.存在点P,M,使得二面角![]() ![]() |
C.当P为棱![]() ![]() ![]() |
D.当M为![]() ![]() ![]() |
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