如图,在直三棱柱
中,
,
,
是
的中点,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/4906f8b4-646e-4328-b884-f9840e91dee9.png?resizew=151)
(1)求异面直线
与
所成角的大小;
(2)若直三棱柱
的体积为
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2969c0d171078b4d4b100027fe4a0da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a355958abf7dc0f2eb949584cb87907b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/4906f8b4-646e-4328-b884-f9840e91dee9.png?resizew=151)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
(2)若直三棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12c5abd786a6c29929c80374239ea0fd.png)
更新时间:2020-01-16 14:02:08
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在三棱柱
中,四边形
为菱形,
,四边形
为矩形,若
,
,
.
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625062443433984/1625348762009600/STEM/9f1a960528d94a2283cf62d0df5ab7c9.png?resizew=228)
(1)求证:
平面
;
(2)求证:
平面
;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b7b7793d29d66dfdd89e7a6564a35c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94bf87dccddc0a68e3f0d85cee2d9c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625062443433984/1625348762009600/STEM/9f1a960528d94a2283cf62d0df5ab7c9.png?resizew=228)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321302db9ce1bf9ef167c0d3831d5154.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4560fa4ad459b58b723c74bd24e51ebf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3531142aafad00b62ad123b2646373e6.png)
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解题方法
【推荐2】如图,已知
平面
,
,
是等腰直角三角形,其中
,且
.
上是否存在一点
,使
平面
?
(2)在线段
上是否存在点M,使得点B到平面
的距离等于1?如果存在,试判断点M的个数;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aad38b43462ca7a8fb9bc9484ad3a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6d1c1361c9938ed911bfaf8e9beea6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae2a696b84492a736c5b444e61b7ad96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8f70cf3f6c7acbf60d4a4ca0ce89619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0701f67727b0fc8100cfb5e20ec27d9b.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,在直四棱柱
中,
,
,
,M为
的中点,点N在线段AD上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/5a45b436-a2b3-464a-a3ce-59140b4f0b0d.png?resizew=191)
(1)当
时,求异面直线MN和
所成角的余弦值;
(2)当AN为何值时,直线MN与平面
所成角的正弦值为
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/405effb49ef901476701e72cc47918da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3829997d8af2e692f030cb359761f27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/5a45b436-a2b3-464a-a3ce-59140b4f0b0d.png?resizew=191)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4500272aa458afeeb2fb8fff527c8fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
(2)当AN为何值时,直线MN与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f17e756bcc8b851a1924dcf7e3d9741a.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐2】如图,在平行六面体
中,
,
,
,
,
为
与
的交点.若
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/11/1/2841786488684544/2929140033568768/STEM/e7db9f0a-bd61-4b26-a8da-712e6dcc49c4.png?resizew=190)
(1)用
,
,
表示
,并求
的长;
(2)求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d262480ffb55b7617f44b63f130c154a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e322f79e083e471b34950b9ffabffdc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b377f22aafd3742ad860f77abaacef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7a93a1399ff7a2bde342652479241b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b54aa2b7f9adf409f0ce8e00615432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a75216f7a68428fb8dd41221e854117.png)
![](https://img.xkw.com/dksih/QBM/2021/11/1/2841786488684544/2929140033568768/STEM/e7db9f0a-bd61-4b26-a8da-712e6dcc49c4.png?resizew=190)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4648d56ec5ba86c288bc22737250ba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解答题-问答题
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适中
(0.65)
【推荐3】如图所示,斜三棱柱
中,点
为棱
(不包括端点)上的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/3673b98c-9bc8-4d31-95ea-1c2be221f048.png?resizew=142)
(1)当
等于何值时,
平面
;
(2)设多面体
的体积为
,三棱柱
的体积为
,求
;
(3)若
,
,求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36cf3bff56a7f4ab6c0008e90823025d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac99c0358497d72001cc575f1ade329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b10b969819d397711310c8dbb399ebc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/3673b98c-9bc8-4d31-95ea-1c2be221f048.png?resizew=142)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5763b58c5b81fce6257c9792c5ef6b47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76388ad7f8db6bb0f37efa9700ed26a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87eeb5402a32ccaaa0be4116e98fb00f.png)
(2)设多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f71ab444dbe3c7151181031d77be8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81f4784453d5db30fbb7df3ffa85be30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36cf3bff56a7f4ab6c0008e90823025d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea87fc8705bde72f090cc253f89b0e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a21e57b4383c59f2e78bfcec0770fc1c.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/322dea27776098da737428d2f7519cd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5ab3ca990935ac5a5545398846f6084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcca943ee165b1a3ff7e0cc5f463754b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f73038249a611568193c0bcc286fd7.png)
您最近一年使用:0次