如图,直三棱柱
中,
,
,
,D为
上的点,二面角
的余弦值为
.
![](https://img.xkw.com/dksih/QBM/2011/3/9/1570031906750464/1570031911993344/STEM/7b4fdc4ce5d347a5a6bc1aa4d529df30.png?resizew=246)
(1)求证:
;
(2)求点A到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ad3a578f403b9e6b97fa2dc955fc11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a355958abf7dc0f2eb949584cb87907b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aace2c8c65b870556fa5dfbe9478aeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8213cc803407a5361a99ceb7c882263e.png)
![](https://img.xkw.com/dksih/QBM/2011/3/9/1570031906750464/1570031911993344/STEM/7b4fdc4ce5d347a5a6bc1aa4d529df30.png?resizew=246)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
(2)求点A到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
2011·河北唐山·一模 查看更多[1]
(已下线)2011届河北省唐山市高三年级第一次模拟考试数学理卷
更新时间:2016-11-30 15:01:00
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相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图所示,在四棱锥
中,底面ABCD为直角梯形,
,
,
,点E为AD的中点,
,
平面ABCD,且
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/74591e51-9ddd-42c1-91d5-adcffad16c8e.png?resizew=196)
(1)求证:
;
(2)线段PC上是否存在一点F,使二面角
的余弦值是
?若存在,请找出点F的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e3296db9e9183be1b4e1eeb3d2eb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd54724fcdc9c17b35d31c6ba599c93a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17622ea6f6f5afd1ad817a557e5889d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66c64b1eb9a67b89c3997c91be620f88.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/74591e51-9ddd-42c1-91d5-adcffad16c8e.png?resizew=196)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4125524caac016727c80d2722c5ba3.png)
(2)线段PC上是否存在一点F,使二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b8c75b0e52a073e9271ed93465b861.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83303d3784492506fc44f2b4d6b07bc1.png)
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解答题-证明题
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【推荐2】如图,已知斜三棱柱
中,
,
在底面ABC上的射影恰为AC的中点D,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/ebcfdf7c-4393-43e6-b3d1-b6f18a71bd3b.png?resizew=213)
(1)求证:
;
(2)在直线
上找一点
,使得二面角
的平面角为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/912c9b5542c5da7a3c5706d5f366b48a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988ac0247c60cbb622f2330276c6190d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/ebcfdf7c-4393-43e6-b3d1-b6f18a71bd3b.png?resizew=213)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f88e7df45acca3fc3d3da3370f0c32bc.png)
(2)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e97fcdcfd6183b976a61ef3222c607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/260fb70cbd71edc976a8f4274d60043d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ff7caec4fdd8fb54a3ffbff9692414.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐3】如图所示,正方体
中,点
在棱
上运动,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/2f549c0c-766c-40a8-b68e-a73d52e4380a.png?resizew=200)
(1)若
为
中点,求证:
平面
;
(2)若
,求当
为何值时,二面角
的平面角的余弦值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/2f549c0c-766c-40a8-b68e-a73d52e4380a.png?resizew=200)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ae72f5e5891249caa10c43224da89c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55ba1f8922a40840d56b1e9b3ae72a5b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/772a8912868795106fb4b7a8d5db6f6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec24b6a6c1b801ab20c89f69220803dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e1f118774f4f4bd15ed7dd43776be4.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1】如图,在三棱锥
中,
平面
,点
满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
平面
,且
在平面
内的射影恰为
的重心.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/e9f9b852-7b57-4ad3-b6ec-360e4cd7b08c.png?resizew=144)
(1)求直线
与平面
所成角的正弦值;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fdee8f7ac9abfe2bd5d3c6694de9c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90efeec739b57e22e50703a03cda856.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4d781525777c7b5284dffc70b2a28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/e9f9b852-7b57-4ad3-b6ec-360e4cd7b08c.png?resizew=144)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4d781525777c7b5284dffc70b2a28a.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1de7da3ab92e70f135ea628a691167.png)
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解答题-证明题
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(0.65)
名校
解题方法
【推荐2】如图,四面体
中,
,
,
,E为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/a3e792b4-4cee-4a38-b232-ca71ce9ee967.png?resizew=169)
(1)证明:
⊥平面
;
(2)设
,
,
,点F在
上,若
与平面
所成角的正弦值为
,求点F到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89a6e9864194f5b8d6e0dc534376aef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0383f8245ace6d1abbaada18d52c8c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/a3e792b4-4cee-4a38-b232-ca71ce9ee967.png?resizew=169)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5322a78b02c2bc387ea7dce3e9461974.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041b85054f9442650fa5cf2e7dd1ef4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ad39474bacab0f0ca9417460943b95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74fe624c03051fc4a81383888de774bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
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