如图所示,四边形
是菱形,
平面
,
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/270373a3-c083-4ea3-93d6-5536b1b8c3b1.png?resizew=171)
(1)求证:
平面
;
(2)求证:平面
平面
;
(3)若
,
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a22d6b860f06fe23618b0d3de6768fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/270373a3-c083-4ea3-93d6-5536b1b8c3b1.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d98d25467d8a11ddeeb1e6e18eb704f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/628b6f7392b6570676535c10fbb789a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c016262f7c32817de8cb270fc9244f5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
更新时间:2020-09-01 15:02:41
|
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,在多面体
中,面
为正方形,面
和面
为全等的矩形,且均与面
垂直.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/f85cf423-c985-4876-90f0-cdaf3c5d17d7.png?resizew=174)
(1)求证:平面
平面
;
(2)若直线
和平面
所成角的正弦值为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20e38a1b5cfffd43a3405481a1d67cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50cfd99a702ee24f9ef94e4b6f50101f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/f85cf423-c985-4876-90f0-cdaf3c5d17d7.png?resizew=174)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dff29779a860ddd0f6fcc74f29678e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09219dbd440c70d66bf2bf8b4c2bfe2f.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb825a9777a4d0aa62b8d764e4ad0d26.png)
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解答题-证明题
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适中
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名校
解题方法
【推荐2】如图,在直棱柱
中, 点
分别为
的中点, 线段
与线段
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/8eb61854-6fdc-4c5d-9bda-7849bd0f9404.png?resizew=232)
(1)求证: 平面
平面
;
(2)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b91a14aaa4e8f8d99197a719d22fd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/695b0b58e60dd3d2da6388848d373a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2aac317b1d6a5873425804a48925b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e7868ec8dd3bafbb50b970c2bd9e4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc3e8a1475b983d1a4295db0e16d4c2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/8eb61854-6fdc-4c5d-9bda-7849bd0f9404.png?resizew=232)
(1)求证: 平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7bdd5574ff93626beee73c75e1fe4fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62fd0b510920be6bc60d170c3ff3da3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8949941bdeebc1157dd7454dd459d414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1abb0689a1b505c02d1db45b4866275d.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在三棱锥
中,平面
平面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2018/2/10/1879143669456896/1879872111566848/STEM/95f44347a93140eea668e05228c7881f.png?resizew=192)
(1)求三棱锥
的体积;
(2)在平面
内经过点
,画一条直线
,使
,请写出作法,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1510640bdb0df67222998ff4c81faf10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://img.xkw.com/dksih/QBM/2018/2/10/1879143669456896/1879872111566848/STEM/95f44347a93140eea668e05228c7881f.png?resizew=192)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
(2)在平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae12f00b2e03d50b244c757a2fa5e56.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,在三棱柱
中,四边形
是边长为
的正方形,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/9310bb1a-e2b9-47e0-af72-b7f35332252c.png?resizew=152)
(1)求证:
平面
;
(2)求直线
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/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d399572bdc5816897500121034d1100c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/9310bb1a-e2b9-47e0-af72-b7f35332252c.png?resizew=152)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
您最近一年使用:0次
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适中
(0.65)
【推荐3】如图,在四棱锥P-ABCD中,底面ABCD是正方形,侧棱PD
底面
,垂足为F,点E是PC的中点,
![](https://img.xkw.com/dksih/QBM/2011/4/1/1576739822256128/1576739876249600/STEM/05390f79f1be4e88aa05699749308118.png?resizew=178)
(1)求证:PA∥平面BDE;
(2)求证:PB⊥平面DEF;
(3)求二面角B—DE—F的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e726b3e53a7c4f5bced2d785213d24c4.png)
![](https://img.xkw.com/dksih/QBM/2011/4/1/1576739822256128/1576739876249600/STEM/05390f79f1be4e88aa05699749308118.png?resizew=178)
(1)求证:PA∥平面BDE;
(2)求证:PB⊥平面DEF;
(3)求二面角B—DE—F的余弦值.
您最近一年使用:0次
解答题-证明题
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名校
解题方法
【推荐1】如图,在四棱锥
中,底面四边形
的边长均为2,且
,棱
的中点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/8f425951-74db-4427-a444-c6e019471e1e.png?resizew=159)
(1)求证:
平面
;
(2)若
的面积是
,求点
到平面
的距离.
![](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/0997c008254823e6e7c6793f8907fa77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/8f425951-74db-4427-a444-c6e019471e1e.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0bb4ef08f6070a6bbc54ea9c4f130d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10e8abf8690e4b129466ddb918bcc94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f491a794b9ac1a85a18c87ecee616c.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2】如图,在直三棱柱
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2498b78493e5ba9c3c4dd582e866e76b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/fb15caaf-6b1d-4499-8158-1ca365281aa5.png?resizew=161)
(1)求点
到面
的距离;
(2)在线段
上是否存在一点
,使得
与平面
所成的角为
?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2498b78493e5ba9c3c4dd582e866e76b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/fb15caaf-6b1d-4499-8158-1ca365281aa5.png?resizew=161)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13cfdc6224181d44e63aab43ddaf07ef.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bbb6866e3de318816805bb340998031.png)
您最近一年使用:0次