如图,在三棱柱ABC A1B1C1中,侧棱垂直于底面,AB⊥BC,
,
E,F分别是A1C1,BC的中点.
(Ⅰ)求证:C1F∥平面ABE;
(Ⅱ)求三棱锥E-ABC的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e95504c8437a496079468f0189469900.png)
E,F分别是A1C1,BC的中点.
(Ⅰ)求证:C1F∥平面ABE;
(Ⅱ)求三棱锥E-ABC的体积.
![](https://img.xkw.com/dksih/QBM/2017/11/28/1826929563320320/1828390661029888/STEM/560ec7caeadd44ad8af279654f17d2df.png?resizew=133)
更新时间:2017-11-30 15:33:14
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在四棱锥
中,底面ABCD为矩形且
,侧面
底面ABCD,且侧面PAD是正三角形,E、F分别是AD、PB的中点.
![](https://img.xkw.com/dksih/QBM/2021/12/20/2876698147528704/2942950486368256/STEM/4e0782e2-a2b5-483d-a11c-0b9ddbcbfa63.png?resizew=165)
(1)证明:
平面PCE;
(2)求直线CF与平面PCE所成角的正弦值;
(3)求点F到平面PCE的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b929269c53a44907dba8ee298a0a522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://img.xkw.com/dksih/QBM/2021/12/20/2876698147528704/2942950486368256/STEM/4e0782e2-a2b5-483d-a11c-0b9ddbcbfa63.png?resizew=165)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9c89e28bb3b5ce434e8ebea6363339.png)
(2)求直线CF与平面PCE所成角的正弦值;
(3)求点F到平面PCE的距离.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,在四棱锥
中,底面
为矩形,点
、
分别为线段
、
上的点,且满足:
,
.
![](https://img.xkw.com/dksih/QBM/2021/10/18/2832122783432704/2832981440184320/STEM/113c99b2-967c-44df-8aa1-67583e67980d.png?resizew=249)
(1)证明:
平面
;
(2)若
,
,求
的长.
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5ff5e62a1ae1c7cf1ef17ece71a522a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74aa15b8ce4cad92465552d60405f8fd.png)
![](https://img.xkw.com/dksih/QBM/2021/10/18/2832122783432704/2832981440184320/STEM/113c99b2-967c-44df-8aa1-67583e67980d.png?resizew=249)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d46554105150391e671609fc6348a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1af5e8cc3b8dd8a6b69dfe0be870ca29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08aa6fd52f3933cbded9ce8c880b4a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在四棱锥P-ABCD中,底面ABCD是正方形,且AD=PD=1,平面PCD⊥平面ABCD,∠PDC=120°,E为线段PC的中点,F是线段AB上的一个动点.
![](https://img.xkw.com/dksih/QBM/2021/8/1/2777023962857472/2821664006619136/STEM/bee00d05ffa24e4783b23a803b477b11.png?resizew=172)
(1)求证:平面DEF⊥平面PBC;
(2)设平面CDE与平面EDF的夹角为θ,试判断在线段AB上是否存在这样的点F,使得tan θ=2
,若存在,求出
的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/8/1/2777023962857472/2821664006619136/STEM/bee00d05ffa24e4783b23a803b477b11.png?resizew=172)
(1)求证:平面DEF⊥平面PBC;
(2)设平面CDE与平面EDF的夹角为θ,试判断在线段AB上是否存在这样的点F,使得tan θ=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ddb339df743a4f0347823beee5516b6.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】三棱柱
中,
,
,侧面
为矩形,
,二面角
的正切值为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/24/29dd7707-88e8-438c-9b55-235cbc330a92.png?resizew=196)
(1)求侧棱
的长;
(2)侧棱
上是否存在点
,使得直线
与平面
所成角的正切值为
,若存在,判断点的位置并证明;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3e9ef3e849788645552cfb0735d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc5b398965f6cefede6b94469b5b71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524931a902bacd35904905b0a12a947c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/24/29dd7707-88e8-438c-9b55-235cbc330a92.png?resizew=196)
(1)求侧棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
(2)侧棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1174142f3bba761585b6bc2653009b36.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐3】如图为一个组合体,其底面
为正方形,
平面
,
,且
.
(1)证明:
平面
;
(2)证明:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b73f874048f9e48ae35ee95bbf443bce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc3b89860bcc3e950f1b21575579d8bb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/21/867f3236-6c45-487b-b155-061c431c48b7.png?resizew=170)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7175df06e33cad4e6bbc3f2f6b0a2986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
您最近一年使用:0次