名校
解题方法
1 . 如图,在棱长为
的正方体
中,
为棱
的中点,
,
分别是棱
,
上的动点(不与顶点重合).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/7230b3f9-55f8-4ce6-9945-25efc93a341a.png?resizew=180)
(1)作出平面
与平面
的交线(要求写出作图过程),并证明:若平面
平面
,则
;
(2)若
,
均为其所在棱的中点,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](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/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/7230b3f9-55f8-4ce6-9945-25efc93a341a.png?resizew=180)
(1)作出平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abb06405623edb5c9d5f7350d79dc76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8b5a6dbcf05f572f83f51abf7d668c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ecd2020a3f7767e54ab47e640399a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d47e5be88e89d0d042c56d2d6942b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c6b8443e6525024643e9d87c45640f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d47e5be88e89d0d042c56d2d6942b0.png)
您最近一年使用:0次
名校
2 . 以下四个命题中,为假命题的有__________ .(填序号).
(1)过直线外一点有且只有一个平面与已知直线垂直;
(2)如果两条直线和一个平面所成的角相等,则这两条直线一定平行;
(3)两两相交且不过同一点的三条直线不一定共面;
(4)垂直于同一平面的两平面平行.
(1)过直线外一点有且只有一个平面与已知直线垂直;
(2)如果两条直线和一个平面所成的角相等,则这两条直线一定平行;
(3)两两相交且不过同一点的三条直线不一定共面;
(4)垂直于同一平面的两平面平行.
您最近一年使用:0次
3 . 已知
是两条不同的直线,
是两个不同的平面,有下列命题:
①若
,则
;
②若
,则
;
③若
,则
;
④若
,则
;
其中正确命题的个数是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1c8146d084248c9c65dd8a11801905.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5399d531ed6f61bdb2da77877d45eea9.png)
![](https://img.xkw.com/dksih/QBM/2016/8/8/1572962304286720/1572962309734400/STEM/2c8e6f93e3224423a7b6b1510ad7e3d3.png)
②若
![](https://img.xkw.com/dksih/QBM/2016/8/8/1572962304286720/1572962309734400/STEM/aeb3e244d42c4dd3b888f3b21fa1cdcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95938408acc91db121ccf810a43f1c8f.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3155f2eba052c066db6f0b485deeede0.png)
![](https://img.xkw.com/dksih/QBM/2016/8/8/1572962304286720/1572962309734400/STEM/aed5e9b0594c4501b2ebef0c571ae783.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b14db0c100ae09acd4d37c2ecb688ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e91e7a3b0e2708782def67d197589b9.png)
其中正确命题的个数是
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
4 . 如图,三棱锥P-ABC中,PA⊥平面ABC,AB⊥BC,D为PB的中点,E为PC的中点.
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081757696/STEM/d05384891b3645f1be79ec79725f677e.png)
(Ⅰ)求证:BC∥平面ADE;
(Ⅱ)若PA=AB=BC=2,求三棱锥A-BDE的体积.
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081757696/STEM/d05384891b3645f1be79ec79725f677e.png)
(Ⅰ)求证:BC∥平面ADE;
(Ⅱ)若PA=AB=BC=2,求三棱锥A-BDE的体积.
您最近一年使用:0次
5 . 已知a,b为两条不同的直线,
,
为两个不同的平面.在下列四个命题中:
①若
,
,则a∥b;
②若
,
,则a∥b;
③若
,
,则
;
④若
,
,则
.
正确命题的个数是
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081438208/STEM/ffcfeb8c7e8e4fa69776e5a53423efd4.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081438208/STEM/262d46268a254a9e88472f647a6b4359.png)
①若
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081438208/STEM/774aa36b0d1a497988342ceca4e2f4c5.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081438208/STEM/b00db7f4967147cc91b435ce62a7cab3.png)
②若
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081438208/STEM/f2e510e4c51a4cbebb891aa6f4af0ea9.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081438208/STEM/4c9ea5fcfa834bb29ab373b80f7ec301.png)
③若
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081438208/STEM/774aa36b0d1a497988342ceca4e2f4c5.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081438208/STEM/960ea3a590b046e0bf1b0855ed784363.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081438208/STEM/35d8e0666b814bec882b2e996bad035a.png)
④若
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081438208/STEM/4c9ea5fcfa834bb29ab373b80f7ec301.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081438208/STEM/e5aede0e32414fd8a8c3d123ec88f24f.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081438208/STEM/35d8e0666b814bec882b2e996bad035a.png)
正确命题的个数是
A.1 | B.3 | C.2 | D.0 |
您最近一年使用:0次
6 . 已知
是两条不同直线,
是一个平面,则下列说法正确的是
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496762454016/1572496768147456/STEM/da88f38c65b3488d81ac56283b4567e0.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496762454016/1572496768147456/STEM/d3a2fc3ab48049b48dfe52e8475ec99d.png)
A.若![]() ![]() ![]() |
B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() |
您最近一年使用:0次
7 . 设
,
是两条不同直线,
,
是两个不同的平面,下列命题正确的是
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572053551022080/1572053556715520/STEM/c25bd4ec02bb4015b878487d386794c7.png)
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572053551022080/1572053556715520/STEM/5d5b589d2483434097b52e96ff2fdb88.png)
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572053551022080/1572053556715520/STEM/750ac7ed6f1b4039be2ea98214c0df42.png)
![](https://img.xkw.com/dksih/QBM/2015/3/31/1572053551022080/1572053556715520/STEM/983aabce2cad49dc84b4dce05392a1df.png)
A.![]() ![]() ![]() ![]() |
B.![]() ![]() ![]() ![]() |
C.![]() ![]() ![]() ![]() |
D.![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
8 . 设m、n是不同的直线,
、
是不同的平面,有以下四个命题:
①若
,则
;
②若
,则
;
③若
,则
;
④若
,则
.
其中,真命题的个数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d1a34ae2b8c77f8d7e355c6d1d667e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74c62c14a017007a6bdfe25eada9c433.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc4f8b8bf4383bc0326c31f1732cac7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95938408acc91db121ccf810a43f1c8f.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81be2e109a65f5f95ec354cdce2e52ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/517f52b173074ce81d881010aa592913.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f3ba4f0b4217e8900a7e8afbd51021.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59125d06d7a90bf51db555a988025c34.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ba0e75d95b23b36f1c984cc71994f82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3defc01ca0544b155ce049ce77359407.png)
其中,真命题的个数为
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次