如图所示,已知在五棱锥
中,底面
为凸五边形,
,
,
,
,F为
上的点,且
,平面
与底面
垂直.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/848bf930-4f24-4675-b87c-677583fc8d25.png?resizew=175)
(1)
平面
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be89b9d1709d7974a108142c5fa2ccec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b8eec9376f6e6a314da534b095f090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa1c07becd03537beeb09a31745cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a4f3cc6ee79060492cfb42a4224464f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a4df1984eb4bf72f66e399fe43494f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6c2dad46a9052a4185a4f7b4ae8a2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/848bf930-4f24-4675-b87c-677583fc8d25.png?resizew=175)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f8b463fcecf0a757f386db56e074d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6c2dad46a9052a4185a4f7b4ae8a2e.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6baeb6a4b50a675e84804eb80288980.png)
更新时间:2020-06-25 07:20:23
|
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
直角梯形,
,
,
是等边三角形,且
,
.
![](https://img.xkw.com/dksih/QBM/2021/12/21/2877407610167296/2878777354461184/STEM/3d34b892-39b4-4b13-88f9-d937eb1d5720.png?resizew=353)
(1)设平面
平面
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
平面
;
(2)若
,求证:平面
平面
.
![](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/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e93b4787448ee5858e81109cc208b7b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e12d565cb0801c5e3025d2a030182a2e.png)
![](https://img.xkw.com/dksih/QBM/2021/12/21/2877407610167296/2878777354461184/STEM/3d34b892-39b4-4b13-88f9-d937eb1d5720.png?resizew=353)
(1)设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a09d03d26008b17d89e98125eff110c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/747e7c4b2f940a9f0a7300a5d0f11cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d50a68fed1c23837d1267bdda5c1962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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,已知正三棱柱
,
,
、
分别为
、
的中点,点
为线段
上一点,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebd5144c27c1d60243c0978f1b73456.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/f17e31d2-a188-4912-aa0d-a9a778ce0f89.png?resizew=155)
(1)求证:
平面
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf90bac174f02c4552e56df4d910bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebd5144c27c1d60243c0978f1b73456.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/f17e31d2-a188-4912-aa0d-a9a778ce0f89.png?resizew=155)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4557a368725226f2c8ea2efb7d30e478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d9489bb74ccb8bc11c4d7d48b363850.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ceb3c582b074d63bd7f8538b18bdb5.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
是边长为2的正方形,
,
,
,
.
;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb5f97d47fbb49fcfcdc7f5e882a80b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f09078cfef11def13fdeb6ba2b42cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72aeb093f5b0cc2fb0cb0e662d0c9889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7bd02e0adeae92ba9526261b1baf797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39b13d187b25461d85a3b8d10c7b678.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62871bb0dff211fc3bd80f9066c25b29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7495688c046142f688c822209c0e968e.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】在四棱锥
中,
,
,
平面
,
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/f36a95df-18a2-4496-8cc5-62e6baef6f5c.png?resizew=150)
(1)求证:
;
(2)求证:
平面
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a4b8b69b419c557ba61a2bdfaf4066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5305576a935a69156191babf8d184b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50539629ac736c2e2dfef90f4fa6eedc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f5019d74a9497f861a0f755ea31d010.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/f36a95df-18a2-4496-8cc5-62e6baef6f5c.png?resizew=150)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14d4071b2a24713dfe275d0eac914045.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d27ff0b39832f094ec51e28721d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】在平行四边形ABCD中,
,
,将
沿BD翻折,使点A到达点P处,平面
平面PBC.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/20/08425ab5-52ef-4557-927f-b035c324dd7f.png?resizew=330)
(1)证明:
平面BCD;
(2)若点M满足
,二面角
的大小为60°.求实数λ的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1bc4fc54bab7ca49f6fc1c60ee54219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/20/08425ab5-52ef-4557-927f-b035c324dd7f.png?resizew=330)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
(2)若点M满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62634b76241cef6e250eee87dad489c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04e376d75882fa61c533dbf33ea6f17.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图,在三棱锥
中,
,平面
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/06389e02-fa18-4e4d-9e2b-e7cdd043086a.png?resizew=179)
(1)证明:
平面
;
(2)设点
在线段
上,直线
与直线
所成的角为
,求平面
与平面
所成的锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08313da7b66283d2e0b3987f3e6761f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2a1eb192268e7ee48c7c5fab76b8240.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/06389e02-fa18-4e4d-9e2b-e7cdd043086a.png?resizew=179)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20b69099d2b74ffbb1f365e1468bd8fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422210c777ac0d625bbd81cc7601bf9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
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