如图,长方体
中,
,
与底面ABCD所成的角为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
.![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/f97947c7-6975-4907-8973-765e7764848d.png?resizew=138)
(1)求四棱锥
的体积;
(2)求异面直线
与
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4957406b21df59fdf7fa184752287b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/f97947c7-6975-4907-8973-765e7764848d.png?resizew=138)
(1)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e2e341788ce1be913bc47b3831c6baa.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
更新时间:2022-12-12 23:41:04
|
相似题推荐
解答题-问答题
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【推荐2】用反正弦函数值的形式表示下列各式中的x.
(1)
;(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408b54c70ae19355c05f710954faf56a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e607a83d1a79d2f3684e4be1f9b3b8d.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐3】如图,在三棱锥
中,
平面
,
分别是棱
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/e10c23d2-345c-49fa-9fe5-3d7fe46dda3f.png?resizew=177)
(1)求证:
平面
;
(2)求直线
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9177a42f9ab232822de2b889a572932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd3ae21f596c15f524719d68b617b48c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/e10c23d2-345c-49fa-9fe5-3d7fe46dda3f.png?resizew=177)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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解答题-证明题
|
较易
(0.85)
解题方法
【推荐1】如图所示,
平面
,点
在以
为直径的
上,
,
,点
为线段
的中点,点
在半圆
上(
弧长小于
弧长),且三棱锥
的体积
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/e03d65cc-037f-4c72-b16b-650730cdf420.png?resizew=192)
(1)求证:
平面
;
(2)平面
平面
;
(3)设二面角
的大小为
,求
的值.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca0b614cdcebac47b434db4aa75b518.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83a04565a8ebaa111894b724b0ba266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d95eb5fb539b9c4c629d30b40fa47939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8c02f0238605da27235a11daf94bd08.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/e03d65cc-037f-4c72-b16b-650730cdf420.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af142a6050b54e8b5777a085d4597481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df5935c893580c77ab6fa6eb0a70bdb.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d349fe863291b79f668a038ec1fc41e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(3)设二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f67b2e13c73c708d0e0c6134fcdca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
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【推荐2】平面
内
是直角三角形且C是直角顶点,若
.
(1)求证:平面
平面PBC
(2)
是等腰直角三角形且斜边
,
,求棱锥
的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e35f3a470885d88519e1a71db4b323.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/d05a1f82-2465-4779-b9c5-7b428ab45bee.png?resizew=174)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd689863203d6891a6a8ce8b40dd5a90.png)
您最近一年使用:0次
解答题-问答题
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较易
(0.85)
【推荐1】在直角三角形
中,
,斜边
,
是
的中点,现将直角三角形
以直角边
为轴旋转一周得到一个圆锥体,点
为圆锥体底面圆周上的一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/eaace11d-9223-4529-b663-0e39132110cd.png?resizew=141)
(1)求该圆锥体的侧面积;
(2)求异面直线
与
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1df17440481c8da8e0a17f008dbc4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.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/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/886c25cbaff27a9c4cf52dacec0eac4c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/eaace11d-9223-4529-b663-0e39132110cd.png?resizew=141)
(1)求该圆锥体的侧面积;
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
解题方法
【推荐2】如图所示,在正三棱柱
中,D是
的中点,
.
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974301994582016/2975682484338688/STEM/32db62a2-4dbb-42b9-a61e-8e613977b814.png?resizew=153)
(1)证明:直线
平面
;
(2)求异面直线
与
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e169659efad8dd024d28bea85dfd6843.png)
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974301994582016/2975682484338688/STEM/32db62a2-4dbb-42b9-a61e-8e613977b814.png?resizew=153)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1496afecd92a619fbe5e9b736f06f4e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09725a719f3feea344e5eddc4c51b0f9.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次