如图,四棱锥
中,底面
为直角梯形,
,侧面
为直角三角形,
,
.
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894142337851392/2895259064385536/STEM/af2374b243aa4b118294b2770f199999.png?resizew=134)
(1)求证:
平面
;
(2)求证:
;
(3)若
,
,
,判断在线段
上是否存在一点
,使得直线
与平面
所成角的大小为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856ee92ad9683a8c0c06cf90f17dc619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3520ee9cc97a075e889e1625dba1157c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ca5d8b6088325c826866ec69ee84f4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7016389e1eea719e7e16e426ef1abbe0.png)
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894142337851392/2895259064385536/STEM/af2374b243aa4b118294b2770f199999.png?resizew=134)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d3f076d3f5a78fc081c252e9a55d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fb7fae3337c793742989865aaeec6bb.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e2a96ad10f818c9a5ad7ef46a304c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16bb7dbd88c296dada33f7762aaf9298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65cd5d0169b63ca47c5a2840abf51471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365822bd3945e6a3e871ca979c84cc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/840798a31aba0783f96584e0ad7c0d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b899be3c4709ec661d84392b167230.png)
21-22高三上·北京石景山·期末 查看更多[2]
更新时间:2022-01-15 23:22:33
|
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,在四棱锥
中,底面
为菱形,
分别是棱
的中点,且
平面
.
![](https://img.xkw.com/dksih/QBM/2016/11/3/1573113505079296/1573113511321600/STEM/984ff11d177f4c07a0350b35184c86bb.png?resizew=201)
(1)求证:
平面
;
(2)求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6d33ae90b2d49f19166b4da95144d46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db61a563634c0c9ada2d2aa90bed1dac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fff94ae7692477febffe53b03f06e0e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2016/11/3/1573113505079296/1573113511321600/STEM/984ff11d177f4c07a0350b35184c86bb.png?resizew=201)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72221ee5b504d596ff799c0b356aa0ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78307cd417504554a4e2276fe24d1162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f129bc3e3b94149cbf6ac87effe863cc.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,直四棱柱
中,底面ABCD是
的菱形,A
,AB=2,点E在棱C
上,点F是棱
的中点;
(Ⅰ)若E是CC1的中点,求证:EF∥平面A1BD;
(Ⅱ)求出CE的长度,使得A1﹣BD﹣E为直二面角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76a91116b13468941d08445b2611bbcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa0c3c54ad91c0bed7599f2f499f3e31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9dfac63840693baae1725bc53c790bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb6101e45f8d7013bc3dc4197188c0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa62b5a161c20430cb1dda9809247f3.png)
(Ⅰ)若E是CC1的中点,求证:EF∥平面A1BD;
(Ⅱ)求出CE的长度,使得A1﹣BD﹣E为直二面角.
![](https://img.xkw.com/dksih/QBM/2012/1/12/1570686276968448/1570686282399744/STEM/a93ce8c33d5a45d286660770853aa521.png?resizew=201)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】在《九章算术·商功》中,将四个面都是直角三角形的三棱锥称为“鳖臑”.如图,现将一矩形
沿着对角线
将
折成
,且点
在平面
内的投影
在线段
上.已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/5c4b9662-8fee-4c84-bb04-c49943c59ea9.png?resizew=354)
(1)证明:三棱锥
为鳖臑;
(2)点
到平面
的距离;
(3)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee03d4bb4667b6c345221b6c9b0fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c79e56bc6f1db8f446fc5bd34a08865.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/5c4b9662-8fee-4c84-bb04-c49943c59ea9.png?resizew=354)
(1)证明:三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a9ec3b527947cad9caa4537e0cb7e7.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02a7ba7cd0c654714c967a900513ba16.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】在四棱锥
中,
是PB的中点,
是等边三角形,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/00cf2913-41f9-4ca5-89a3-994d709f4526.png?resizew=197)
(1)求证:
平面
;
(2)求CP与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea7ea034cd929ed7ef8a6904a05c511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e2903ff33266528a7902ad51cf8d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/00cf2913-41f9-4ca5-89a3-994d709f4526.png?resizew=197)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b1980f7a8ddeab4265002aa9fdb6920.png)
(2)求CP与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b347a48a3e9785e2733528de68cc4b.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,已知直三棱柱
的底面为正三角形,侧棱长都为4,
、
、
分别在棱
、
、
上,且
,
,
,过
,
的中点M,N且与直线
平行的平面截多面体
所得的截面
为该多面体的一个中截面.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/b326fe73-b78d-4bf5-b26b-9ce6ee16e4a1.png?resizew=139)
(1)证明:中截面
是梯形;
(2)若直线
与平面
所成的角为45°,求平面
与平面
所成锐二面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a7f91368316fadceb5a47b5c45df297.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b09b10f662479431978074c1a99f6b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6903e31448cfcdda8e6f24c11ef844b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c8b7a498f2fa0820ad123a8756ce64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92777fd37c34b8747686db17b0098419.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b3fd6251ce7dd1c0dd86339c35ee729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63377f17464dd3675c605204efa7869a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b09b10f662479431978074c1a99f6b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afab03feeb147d86341c118c5e4d1e85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/b326fe73-b78d-4bf5-b26b-9ce6ee16e4a1.png?resizew=139)
(1)证明:中截面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24dc97d6060d7bdcd077a4803545ec77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24dc97d6060d7bdcd077a4803545ec77.png)
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,已知直三棱柱
分别为线段
的中点,
为线段
上的动点,
.
![](https://img.xkw.com/dksih/QBM/2022/4/1/2948672321257472/2950267420860416/STEM/d31d92b2057046d68282bc843d189656.png?resizew=132)
(1)若
,试证:
;
(2)在(1)的条件下,当
时,试确定动点
的位置,使线段
与平面
所成角的正弦值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85f6a5d974e365078612a0d557cb2475.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf3e8856abb3db476c9e59e22076c1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38de04181584f6854a5c34487d80e2f7.png)
![](https://img.xkw.com/dksih/QBM/2022/4/1/2948672321257472/2950267420860416/STEM/d31d92b2057046d68282bc843d189656.png?resizew=132)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c52e5ec20544d709d98ea8fcf9df73a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074d16f22e98d705cdf1a3322aed3bb3.png)
(2)在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
您最近一年使用:0次