1 . 如图,在三棱柱中,侧面
是矩形,
,
,
,且
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/fc5812d0-79a6-477a-bea9-a91a591417f8.png?resizew=149)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/140088b0cb73812aa9d523c44559298a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e53b212640dadf751ef7f65a78a209.png)
(2)设D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
您最近一年使用:0次
2017-02-08更新
|
1511次组卷
|
4卷引用:【全国百强校】北京师范大学附属中学2019届高三(下)四月份月考数学(文科)试题(五)
2 . 如图,四棱锥
中,底面
是边长为 4的菱形,
,
,
为
中点.
![](https://img.xkw.com/dksih/QBM/2016/3/4/1572518713155584/1572518718963712/STEM/2d0a5c44c5294384ba697fd8c1b2494c.png?resizew=223)
(1)求证:
平面
;
(2)求证:平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
平面
;
(3)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75cf0288e9b7c31a426aff6b91a5a8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86db010859f7a243badec02946a4e24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/2016/3/4/1572518713155584/1572518718963712/STEM/2d0a5c44c5294384ba697fd8c1b2494c.png?resizew=223)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b70cef0b79ca64acbb67dc667fc53b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb96e0331eebe80ed1ff610faf531fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/578fc8dd7d45fd2799f7d05ac89a2024.png)
您最近一年使用:0次
2016-12-04更新
|
1422次组卷
|
2卷引用:2016届北京市丰台区高三上学期期末联考文科数学试卷
解题方法
3 . 如图所示,正方体
的棱长为1,
分别是棱
,
的中点,过直线
的平面分别与棱
、
交于
,设
,
,给出以下四个命题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/5c53e251-4346-4998-867d-e1e90759f9d7.png?resizew=224)
①四边形
为平行四边形;
②若四边形
面积
,则
有最小值;
③若四棱锥
的体积![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e61eac79ec7913fc950226db18915308.png)
,
,则
常函数;
④若多面体
的体积
,
,则
为单调函数.
其中假命题为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b25f3ea33cc08b1e2a0d9c3a9dccaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4af217fbffcef5bd43e1fdc8a7bd6220.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c7b69e93488fcd2a195cb9793e94fc7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/5c53e251-4346-4998-867d-e1e90759f9d7.png?resizew=224)
①四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e92eac740953aa383be636ea90fd47.png)
②若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e92eac740953aa383be636ea90fd47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d4ef9a0424161728f65356fa02620b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
③若四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b941daa059b04aab552429ae22a1661d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e61eac79ec7913fc950226db18915308.png)
![](https://img.xkw.com/dksih/QBM/2016/3/4/1572517993783296/1572517999558656/STEM/f6002b804c144dcd95df67c5839e8c6e.png?resizew=12)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c7b69e93488fcd2a195cb9793e94fc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c97d54952104950bfd7afc0176bbd0.png)
④若多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d806315045c99f270687030c61cd8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b11baa5184a3f07f167cc328f1abf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37bc347c13a4d4171648cad72b96e796.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
其中假命题为
A.① | B.② | C.③ | D.④ |
您最近一年使用:0次
4 . 如图,正方形
与梯形
所在的平面互相垂直,
,
,
,
,
为
的中点.
(1)求证:
平面
;
(2)求证:平面
平面
;
(3)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27db558e8db4c957654c8e5cecd2d2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/30/27396d36-39a5-417e-a0a1-bbd7128408ec.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2061b9ab3862d9c36d32c4ffef91145a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3547a914468b082d8d8741b974a03190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a814b70236a108be5d6e7ff271fe92.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a814b70236a108be5d6e7ff271fe92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
您最近一年使用:0次
2016-12-03更新
|
2290次组卷
|
5卷引用:2011届北京市东城区高三上学期期末理科数学卷
13-14高三·北京西城·期末
5 . 如下图,在四棱柱
中,底面
和侧面
都
是矩形,
是
的中点,
,
.
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb7548af8fc8192e7fd5d1c728681a8.png)
(2)求证:
平面
;
(3)若平面
与平面
所成的锐二面角的大小为
,求线段
的长度.![](https://img.xkw.com/dksih/QBM/2014/4/24/1571654083198976/1571654089015296/STEM/3426770ec8dd485a92c3be89f6ccc3d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8456cee87c4e22351affc28f3a73a0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
是矩形,
![](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/4b5c67745fcf0a5978e01722cb3e07a1.png)
![](https://img.xkw.com/dksih/QBM/2014/4/24/1571654083198976/1571654089015296/STEM/bfe6a75e57c54f939e03e4a0706d7a7d.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb7548af8fc8192e7fd5d1c728681a8.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504a36c231b8e80724d01649e7c0944f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a83c0b8db2205a6815811aa4ff5390f.png)
(3)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a83c0b8db2205a6815811aa4ff5390f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecdab625e32e38d1c72c901cece0e147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15dc61d5de97b5a40be925b278ae494c.png)
![](https://img.xkw.com/dksih/QBM/2014/4/24/1571654083198976/1571654089015296/STEM/3426770ec8dd485a92c3be89f6ccc3d7.png)
![](https://img.xkw.com/dksih/QBM/2014/4/24/1571654083198976/1571654089015296/STEM/bfa1e661d2fd4e7d894765caefe65f72.png)
您最近一年使用:0次