如图,在三棱柱
中,侧面
是菱形,
为
的中点,
为等腰直角三角形,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/f760f0ef-ef08-415d-b79e-7e558cc84b4d.png?resizew=190)
(1)求证:
平面
;
(2)求
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/ab3e0dba5705e1d749cfb21ebbb2ed93.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/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ae7d7bbe2f70f322cda99da8e9221b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2919a662cb6d59eac9aa5cdd69dac847.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/f760f0ef-ef08-415d-b79e-7e558cc84b4d.png?resizew=190)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
更新时间:2020-03-05 10:16:51
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,ACDE为菱形,
,
,平面
平面ABC,点F在AB上,且
,M,N分别在直线CD,AB上.
平面ACDE;
(2)把与两条异面直线都垂直且相交的直线叫做这两条异面直线的公垂线,若
,MN为直线CD,AB的公垂线,求
的值;
(3)记直线BE与平面ABC所成角为
,若
,求平面BCD与平面CFD所成角余弦值的范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209acf15985d1ea1ad86fc4a37e38c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c99e6d75d606b5cae9392ecca969200.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f31a3724c639f88486f8356ca65397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0b72906641ed13716cfbce50923282.png)
(2)把与两条异面直线都垂直且相交的直线叫做这两条异面直线的公垂线,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3177a657a66974f53b49dc827b78c5c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e66082fe6f392885b1e57db9ffb5602.png)
(3)记直线BE与平面ABC所成角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e46b60660836022a46da90173c8ef2e.png)
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解答题-证明题
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适中
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解题方法
【推荐2】如图,在多面体
中,
平面
,四边形
是正方形,
.
;
(2)证明:
平面
;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9bf53e97203aa720fe3a09b9bf534af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaada3d6dea9e247fc816ea088fe81cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9fd76d8997e3b2db7d9cb9b72d0f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04063590eab431e1ca6ab6e7af8479bd.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db807b09cc550f476b3f8fa0c6a14425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ca19321c6776be24e4be5033b60ed7.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】直四棱柱
中,底面
为菱形,且
,
,
为
延长线上的一点,
面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/a23bccc6-4a43-407b-be46-0de1669c9cd2.png?resizew=217)
(1)若
是
的中点,证明:
;
(2)求三棱锥
的体积;
(3)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35909b72f6e48a33ae9abb1d63ff91aa.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/da81a007b14af667599765c89d5b8530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fefd8229243bcbee5ac197740e6c66ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/a23bccc6-4a43-407b-be46-0de1669c9cd2.png?resizew=217)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d5eb339910ace4c4a76ad62b379a90b.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f178906e90bafd73e0ef9f89814855d5.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec287ae85faa7a4b26570ab345357d89.png)
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适中
(0.65)
【推荐1】如图,三角
是边长为
正三角形,
底面
,
,点
是
的中点,点
在
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/06b0a5e8-fa86-4d73-af18-fa7e4f11fbed.png?resizew=216)
(1)证明:
平面
;
(2)求直线
和平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4014edd5ca7ddd954507ab87eb2638e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/06b0a5e8-fa86-4d73-af18-fa7e4f11fbed.png?resizew=216)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37793a3a810e823e10c340986f55ddd.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,四棱台
的底面是矩形,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/330172c3-fed6-4ee4-9556-efc2ee288b50.png?resizew=171)
(1)证明:
平面
;
(2)设平面
与平面
的交线为
,求直线
与平面
所成角的正弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a0c3a4e61b97fa9bc58f3179fc2958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a0247cb8022f81d0897142a537ddbea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43e9effc506d0373565c4394a6cf4e7f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/330172c3-fed6-4ee4-9556-efc2ee288b50.png?resizew=171)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbe5de909b009cd31d076b19faa579f.png)
(2)设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5c7bf9276315761b0b5517e2472e79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a39cf1a9eedda28c63f13ea478ec6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ee01e28681b584f85c8875f053b77b.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图:在四棱锥
中,底面
是菱形,
底面
,
是
中点,
是
中点.
(1)求证:
平面
;
(2)求直线
与平面
所成角的正切值;
(3)求三棱锥
的体积.
![](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/56f8ea41444c650bc66b9a0052a7c3e2.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c372d059202ec388960b125d4a87dc84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fbbe7f48676298f2ee0cb1901992eaf.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/013e58ab92ebfc889e2e0e2be903792e.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16fd1bc6147d69777b26a35d48522f7e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/28/8c5b0d9c-7e0f-478b-8750-f43532db2bbb.png?resizew=161)
您最近一年使用:0次