如图所示,三棱锥
中,平面
平面
,平面
平面
,
分别是
和
边上的点,且
,
,
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/9d2d149a-155a-4fd1-a649-4aa1c422ae53.png?resizew=227)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448cbac9a1ef3de7538a6b30cdc39582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78307cd417504554a4e2276fe24d1162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db7c08836b6577b49677115aefe31f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1804c3641953c30ccf750504eff6577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1f4f255d191786f7d330d278868c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64d5fcee996a47e9cc3cfd4ba108f21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/9d2d149a-155a-4fd1-a649-4aa1c422ae53.png?resizew=227)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bcf5c7c83a913857da308e501c6c4b9.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66e6629d0e1a4ce3fe4f0345f6961473.png)
更新时间:2019-05-02 11:57:20
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】在如图所示的几何体中,四边形ABCD为矩形,AF
平面ABCD,
,
,
,点P为棱DF的中点.
![](https://img.xkw.com/dksih/QBM/2021/11/17/2853342285160448/2858857466494976/STEM/299cd90b-00ea-4162-9515-b5db260b6974.png?resizew=292)
(1)求证:
平面APC;
(2)求直线DE与平面APC所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058f36d315245b63a811d5c6f348c17b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6af63b704381bec4591c3af519b126d6.png)
![](https://img.xkw.com/dksih/QBM/2021/11/17/2853342285160448/2858857466494976/STEM/299cd90b-00ea-4162-9515-b5db260b6974.png?resizew=292)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d32e76582bf550593fdef53e081225.png)
(2)求直线DE与平面APC所成角的正弦值.
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,已知三棱柱
,
底面
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/cb485d18-123a-406a-bd6d-e6f3bd61b1b9.png?resizew=151)
(I)证明:
面
;
(Ⅱ)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ecf072589c0f901d92f6bda111d841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa9591a08d48c6b080c4f9d74f79463f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/cb485d18-123a-406a-bd6d-e6f3bd61b1b9.png?resizew=151)
(I)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/547a4b438e2e6687c7cd55ea08bbaae2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a42cece6a8fb2f94308882d086e1e2f.png)
(Ⅱ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a42cece6a8fb2f94308882d086e1e2f.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】如图所示,四棱锥P﹣ABCD中,PC⊥底面ABCD,PC=CD=2,E为AB的中点,底面四边形ABCD满足∠ADC=∠DCB=90°,AD=1,BC=3.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/2bd755d5-34b0-454b-a61c-0fef58f4f920.png?resizew=188)
(Ⅰ)求证:平面PDE⊥平面PAC;
(Ⅱ)求直线PC与平面PDE所成角的正弦值;
(Ⅲ)求二面角D﹣PE﹣B的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/2bd755d5-34b0-454b-a61c-0fef58f4f920.png?resizew=188)
(Ⅰ)求证:平面PDE⊥平面PAC;
(Ⅱ)求直线PC与平面PDE所成角的正弦值;
(Ⅲ)求二面角D﹣PE﹣B的余弦值.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,在长方体
中,
,
,点
在棱
上运动.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/1e3ec571-6ee0-47c6-b0d3-68d7f0d1489b.png?resizew=168)
(1)证明:
;
(2)设
为棱
的中点,在棱
上是否存在一点
,使得
平面
,若存在,求
的值,若不存在,说明理由;
(3)求直线
与平面
所成角的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc2ec6bad95e10dbda8f1ee4ac93362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/1e3ec571-6ee0-47c6-b0d3-68d7f0d1489b.png?resizew=168)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3af2fef79a35d44f9e11f9d8c5b3f08b.png)
(2)设
![](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/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8ccd4181f956f6e0140bf0ab8f0716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb66e4fa5ca4231b8ce2490eeb192b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5c8ae2f62d6a56f0ad6104814e73e50.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb66e4fa5ca4231b8ce2490eeb192b.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐3】如图,四棱锥
中,底面
为平行四边形,
,
为等边三角形,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b18f8e9fa326b3f960a0d8412bf289.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/3d71bc39-21ef-466e-b6b5-239cac4aac31.png?resizew=227)
(1)证明:
;
(2)求
与平面
所成角的正弦值.
![](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/cd7a42341edbc0b01ab0769c4c02c3e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b18f8e9fa326b3f960a0d8412bf289.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/3d71bc39-21ef-466e-b6b5-239cac4aac31.png?resizew=227)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9104a1941e557a85fd1496bc2b9be297.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次