1 . 如图,在直三棱柱
中,底面
为等腰直角三角形,
,
,
为
的中点,
为
的三等分点(靠近
)点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/dddb4075-924b-4532-9848-db5257a97469.png?resizew=139)
(1)求三棱锥
的体积;
(2)在线段
上找点
,使得
平面
,写出作图步骤,但不要求证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/dddb4075-924b-4532-9848-db5257a97469.png?resizew=139)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbcb3aba9ac40a194bf0ffa014da99a3.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22391e2f16997bb4b99041f8543b2ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1de7da3ab92e70f135ea628a691167.png)
您最近一年使用:0次
名校
2 . 如图所示,三棱柱
中,
,
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/082a34fd-b571-41b7-8a01-7aff6198367f.png?resizew=199)
(1)证明:平面
平面
;
(2)若
,
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3cc9cccfb4c260dac05f4ed57e8c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1d2e0f281222a5f289ea4008370aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/082a34fd-b571-41b7-8a01-7aff6198367f.png?resizew=199)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/283c8668ca30b171ee4352452e1c7e94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40154fd2f71e4621d800834f3656fd40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
您最近一年使用:0次
2019-05-30更新
|
858次组卷
|
7卷引用:【全国百强校】广东省汕头市金山中学2019届高三(上)9月月考数学(文科)试题
18-19高一·全国·单元测试
名校
3 . 如图,四边形ABCD为矩形,DA⊥平面ABE,AE=EB=BC=2,BF⊥平面ACE于点F,且点F在CE上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/c1669e1a-ea7e-41e5-940a-2d55e6238bd4.png?resizew=170)
(1)求证:AE⊥BE;
(2)求三棱锥D-AEC的体积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/c1669e1a-ea7e-41e5-940a-2d55e6238bd4.png?resizew=170)
(1)求证:AE⊥BE;
(2)求三棱锥D-AEC的体积.
您最近一年使用:0次
2019-02-08更新
|
528次组卷
|
4卷引用:2023年广东省普通高中学业水平合格性考试模拟(五)数学试题
2023年广东省普通高中学业水平合格性考试模拟(五)数学试题(已下线)章末检测2(课后作业)-2018-2019版数学创新设计课堂讲义同步系列(人教A版必修2)四川省自贡市田家柄中学教育集团2021-2022学年高二上学期期中考试数学试题甘肃省民勤县第一中学2023-2024学年高二下学期开学考试数学试题
11-12高三上·广东佛山·阶段练习
解题方法
4 . 如图,在棱长为1的正方体
中,
为线段
上的点,且满足
.
(Ⅰ)当
时,求证:平面
平面
;
(Ⅱ)试证无论
为何值,三棱锥
的体积恒为定值;
(Ⅲ)求异面直线
与
所成的角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d5a7b6a93211567783abf11ee3012db.png)
(Ⅰ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500d68f2678989a5ce7431cfd51b019d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f5e22b37cea8a05fa13f85414c7c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ca5b5fd1031438de2d2dd59be8c348.png)
(Ⅱ)试证无论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbf24f4e2a22bf61c8e14bdaf57b7b77.png)
(Ⅲ)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c407eeb34204a1df967b8fbe481cb04d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd4c85bb98a2a0afddd7ed92578ad2e.png)
![](https://img.xkw.com/dksih/QBM/2011/12/18/1570621624582144/1570621630103552/STEM/81711ac1-f1d4-4a98-b455-ad2492e47f04.png?resizew=182)
您最近一年使用:0次