解题方法
1 . 如图,棱长为2的正方体
中,E,F分别为棱
的中点,G为线段
上的动点,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/40506d94-4f2f-4dcc-8667-55f3b3ef4910.png?resizew=166)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afaa4776f2c9598c44f4b6b874afe1e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/40506d94-4f2f-4dcc-8667-55f3b3ef4910.png?resizew=166)
A.三棱锥![]() |
B.存在点G,使得![]() |
C.G为![]() ![]() |
D.点F到直线EG距离的最小值为![]() |
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名校
解题方法
2 . 如图,在长方体
中,
,动点
分别在线段
和
上.给出下列四个结论:
①存在点
,使得
是等边三角形;
②三棱锥
的体积为定值;
③设直线
与
所成角为
,则
;
④至少存在两组
,使得三棱锥
的四个面均为直角三角形.
其中所有正确结论的序号是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbff493a22d755c6b473513e2e39ecc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
①存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
②三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d212fd7c01f61338e720ab1663ef1c85.png)
③设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408871c2b71ef88d6f556ce53cf73cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73bb9697573f2076cae7ecf850152e04.png)
④至少存在两组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7b9d439771d35f8ff433223b6f5785.png)
其中所有正确结论的序号是
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/2/b856b93d-7404-47ce-84eb-80a911a05b7d.png?resizew=188)
您最近一年使用:0次
2023-05-30更新
|
591次组卷
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3卷引用:山西省大同市阳高县第四中学校2022-2023学年高二下学期期末数学试题
名校
3 . 如图,在直三棱柱
中,
分别是
的中点,
是
与
的交点,
为线段
上的动点(包含线段的端点),则以下说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/ef8e7ed3-f532-43de-b0b4-aae0c6591422.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6d37c784f9777639096ba19e6069d8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4dfea6353fc25e88535e865a4982cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a604466a9c8d10d557b3dfc43b547065.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/ef8e7ed3-f532-43de-b0b4-aae0c6591422.png?resizew=160)
A.![]() ![]() ![]() |
B.存在点![]() ![]() ![]() |
C.![]() ![]() ![]() |
D.![]() ![]() ![]() |
您最近一年使用:0次
2023-02-15更新
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408次组卷
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2卷引用:山西省临汾市2022-2023学年高二上学期期末数学试题
名校
解题方法
4 . 在①
,②
,③
,这三个条件中选择一个,补充在下面问题中,并给出解答
如图,在五面体
中,已知___________,
,
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/3bdae97f-1469-4747-829f-667660e2fca3.png?resizew=212)
(1)求证:平面
与平面
;
(2)线段
上是否存在一点
,使得平面
与平面
夹角的余弦值等于
,若存在,求
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57cb0d726cc25a350dc792b539ff2f2.png)
如图,在五面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc22c901160e072ae13a66f62c489f21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d05426a41ec7b22c0445bfe78d786c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7422660f0635be92e11838af5f4b4b5e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/3bdae97f-1469-4747-829f-667660e2fca3.png?resizew=212)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/293a2e244834864e78e93d8c13be6905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72acf5ee54c89dede4358c61ecd7a101.png)
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2021-12-22更新
|
2294次组卷
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7卷引用:山西省运城市2022届高三上学期期末数学(理)试题
山西省运城市2022届高三上学期期末数学(理)试题浙江省杭州第二中学滨江校区2021-2022学年高二上学期期中数学试题重庆市第八中学2022届高三下学期调研检测(五)数学试题(已下线)数学-2022届高三下学期开学摸底考试卷(山东专用)四川省成都市石室中学2021-2022学年高三下学期第三次诊断性考试数学(理)试题(已下线)北京市丰台区2023届高三下学期3月一模数学试题变式题16-21江苏省扬州市2024届高三上学期期初模拟数学试题
解题方法
5 . 如图,在四面体
中,
平面
,
.
,
.M是
的中点,P是
的中点,点Q在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/7850d128-eb0e-4c88-bd91-0fe8f8c55fce.png?resizew=190)
(1)证明:
;
(2)若二面角
的大小为60°,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e46571701ccaa18d3c844ab99ee6c30e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276e3c9755dbd39fb01de614840d230f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/7850d128-eb0e-4c88-bd91-0fe8f8c55fce.png?resizew=190)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be742533a98206940a01156e5cd9ae30.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b70049601f57c8a2ece170c0a9c3c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
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6 . 如图(1),在ABC中,AB3,DE2,AD2,BAC90,DE//AB,将CDE沿DE折到如图(2)中C1DE的位置,点P在C1E1上.
(1)求证:平面PAB平面ADC1;
(2)若ADC160,且AP与平面ABED所成角的正弦值为
,求二面角PADB的余弦值.
(1)求证:平面PAB平面ADC1;
(2)若ADC160,且AP与平面ABED所成角的正弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/924d32b574fe69e43724304cf39513e5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/0df5723a-5aed-4d9a-aead-ca7582cb429a.png?resizew=259)
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2014高三·全国·专题练习
7 . 在四棱锥
中,底面
是边长为1的正方形,且
平面
.
![](https://img.xkw.com/dksih/QBM/2014/3/22/1571570269937664/1571570275336192/STEM/ccc32e9fab444b1283a602ee5c680813.png?resizew=188)
(1)求证:
;
(2)过直线
且垂直于直线
的平面交
于点E,且三棱锥
的体积取到最大值,
①求此时
的长度;
②求此时二面角
的余弦值的大小.
![](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/a583e945f6af87569753591853bf9a31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2014/3/22/1571570269937664/1571570275336192/STEM/ccc32e9fab444b1283a602ee5c680813.png?resizew=188)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4125524caac016727c80d2722c5ba3.png)
(2)过直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42020cfacd62b300cad053981bab9e0b.png)
①求此时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
②求此时二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370148e9147aa25c60a07ab4ad46e83d.png)
您最近一年使用:0次
2016-12-02更新
|
3046次组卷
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3卷引用:2015-2016学年山西太原五中高二上学期期末理科数学试卷