如图,在直三棱柱
中,
平面
,其垂足
落在直线
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/17/766597e7-dfca-4c78-8e5c-6c476adb057b.png?resizew=151)
(1)求证:
;
(2)若
是线段AB上一点,
,
,三棱锥
的体积为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/17/766597e7-dfca-4c78-8e5c-6c476adb057b.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b4cdc3a083d1263634d510f172dab09.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/283c8668ca30b171ee4352452e1c7e94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e6d761c7fd9b42e8d8701351c76650d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf6c7b71d5689f613d106a141b548434.png)
更新时间:2023-05-17 13:16:41
|
相似题推荐
【推荐1】如图,
是圆
的直径,矩形
垂直于圆
所在的平面,
,
.
![](https://img.xkw.com/dksih/QBM/2017/4/26/1673914357702656/1675276337029120/STEM/c1db1d68108240a19025e517336c7a3a.png?resizew=206)
(1)证明:平面
平面
;
(2)当三棱锥
体积最大时,求三棱锥
的高.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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![](https://img.xkw.com/dksih/QBM/2017/4/26/1673914357702656/1675276337029120/STEM/c1db1d68108240a19025e517336c7a3a.png?resizew=206)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)当三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32fdd65aa55d1833750ef453a295d19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32fdd65aa55d1833750ef453a295d19.png)
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【推荐2】如图,已知菱形
和矩形
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b50ace426f8edba53ecafb6c6d0db6.png)
点
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/c412ddce-8369-4501-9642-b667d585d360.png?resizew=215)
(1)求证:
∥平面
;
(2)平面
平面
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b50ace426f8edba53ecafb6c6d0db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64ebd9f86e459e38379e884b69b12be2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/c412ddce-8369-4501-9642-b667d585d360.png?resizew=215)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0833604f65b772c43cbe75a30d4570d0.png)
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【推荐3】如图,在多面体ABCDE中,四边形BCDE是矩形,△ADE为等腰直角三角形,且∠ADE=90°,
=AD=
,BE=2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/f3906d41-3096-43c6-ab84-20126f3f3bcc.png?resizew=131)
(1)求证: BE⊥AD;
(2)线段CD上存在点P,使得二面角P-AE-D的大小为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d49404351575703cfe8325d1352ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/f3906d41-3096-43c6-ab84-20126f3f3bcc.png?resizew=131)
(1)求证: BE⊥AD;
(2)线段CD上存在点P,使得二面角P-AE-D的大小为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212b200cb65843fe03aab377d53991d7.png)
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解题方法
【推荐1】如图,在四边形
中,
于交
点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71ef914882dcafa19ed1ea63ff3008d.png)
,
.沿
将
翻折到
的位置,使得二面角
的大小为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/8cf0fc60-49d4-4274-9afc-427e1844bb65.png?resizew=235)
(1)证明:平面
平面
;
(2)在线段
上(不含端点)是否存在点
,使得二面角
的余弦值为
,若存在,确定点
的位置,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6992cf6aa556bf6e61f098ee75f2de66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc50511075e9645c3201be97170ae7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71ef914882dcafa19ed1ea63ff3008d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72e49817548cb45b3d1e58570644c6fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec6246613bb4c4b2ef93770e427e8eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/8cf0fc60-49d4-4274-9afc-427e1844bb65.png?resizew=235)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda0f75d56aa1571a0839619ffe21fed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b4e098c6194f55462b24f552f5967.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f1a057a619eec2f14d65aff8bcd0906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐2】如图,四棱柱P-ABCD,AB∥CD,∠BCD=90°,AB=2BC=2CD=4,△PAB为等边三角形,平面PAB⊥平面ABCD,Q为PB中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/05fba43b-fb95-4639-b53d-08db99de3123.png?resizew=183)
(1)求证:AQ⊥平面PBC;
(2)求平面PBC与平面PCD的锐二面角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/05fba43b-fb95-4639-b53d-08db99de3123.png?resizew=183)
(1)求证:AQ⊥平面PBC;
(2)求平面PBC与平面PCD的锐二面角的余弦值.
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解题方法
【推荐1】如图,三棱柱
中,E为
中点,F为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/8309f077-6f42-4428-906e-d7ccb5fb5854.png?resizew=142)
(1)求证:
平面ABC;
(2)若
平面
,求证:
平面ABC.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/8309f077-6f42-4428-906e-d7ccb5fb5854.png?resizew=142)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a407b262c22419f73396170ecdc849.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf6fde6ec44bba7726b6f2d07b3b179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d25e8fc3dda4f8b45491514b6e22a962.png)
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【推荐2】如图,在矩形ABCD中,
,
,点E是边AD上的动点,沿BE将
翻折至
,使二面角
为直二面角.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/14/2116d150-be7f-47f7-a64f-b294fb0c616e.png?resizew=319)
(1)当
时,求证:
;
(2)当线段
的长度最小时,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438bf2134641f9950932bd667188d63c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8267d832508d4bee00ff2d4a4bd2b6e5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/14/2116d150-be7f-47f7-a64f-b294fb0c616e.png?resizew=319)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d1a60d31ddfd07fef3bd84788363e5.png)
(2)当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d32d6223db260eeeece35fa057229ccd.png)
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【推荐3】如图,在三棱柱
中,
,
.
(1)证明:
;
(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/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb36baa03b28d2ddb4bafa0cd094d9f8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/22/da5a4dfe-ad56-4de0-9008-b35af5a88915.png?resizew=159)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943b0dc0ce6e62cb6985d15e5c8baa5b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4639a9dc0bc99101cbde59fef04b4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a677b42f8b427b21924a559b90141d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aedf65d7d930fdb972d4802c0dea8b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45cbb74984939d59964559c3560ef7ba.png)
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