如图,在三棱锥
中,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/06b254a2-54be-4f97-8edb-883e3530b250.png?resizew=148)
(1)证明:平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若
为
的中点,求平面
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b0589dff841c005b8ce0cf294ccf10f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/06b254a2-54be-4f97-8edb-883e3530b250.png?resizew=148)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe1ea4b0860a2595fb9d3f25a304374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
更新时间:2024-01-11 07:40:06
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相似题推荐
解答题-证明题
|
适中
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名校
【推荐1】如图,三棱柱
的所有棱长都是2,
平面ABC,D,E分别是ABC,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/08b04301-8ada-463c-83cf-e692fc528c7f.png?resizew=210)
(1)求证:面
面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/08b04301-8ada-463c-83cf-e692fc528c7f.png?resizew=210)
(1)求证:面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94915911320ab78feb91c72914b089c.png)
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【推荐2】已知四棱锥
的底面是正方形,
平面
.
平面
,求证:
;
(Ⅱ)求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d2fe3de0e127e7cb08eb05a2615ec4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93de1ae2d8a0edbffbdee89d2cb89d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edbf6462666c8015e7de28e344af30b2.png)
(Ⅱ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78307cd417504554a4e2276fe24d1162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5000fea066102e62cf2128ccbbd2b3e3.png)
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【推荐1】如图,在四棱锥
中,
,
,
,AB=AC=2,AE=ED=1.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/1b66493c-c26b-4f22-87d8-9c5efe2a5712.png?resizew=171)
(1)若F为AC中点,G为AB中点,
,求证:
平面BCD;
(2)若平面
平面ABC,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9045e6cd575bbe76c89ef6ef852fd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7bd02e0adeae92ba9526261b1baf797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/032b3e422eeb39cf649dffc9934a7cf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/1b66493c-c26b-4f22-87d8-9c5efe2a5712.png?resizew=171)
(1)若F为AC中点,G为AB中点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c97a7fab5d1550e2fef66772cc985fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5d62dcf1c173fe35595dfed43f9c87.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31effd1d3f7ce1f6e57be80c7f3af4ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9fac14c8330781420fa076b2e04e77.png)
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【推荐2】如图,在三棱锥
中,
是等边三角形,∠PAC=∠PBC=90º.
(1)证明:AB⊥PC;
(2)若
,且平面
⊥平面
,求三棱锥
体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
(1)证明:AB⊥PC;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eea78bf026d76f1cb9cc3dc9349a193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
您最近一年使用:0次
解答题-证明题
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解题方法
【推荐1】如图所示,四棱锥
中,
底面
,
,
为
的中点,底面四边形
满足
,
,
.
平面
;
(2)求直线
与平面
所成角的正弦值;
(3)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02941fc1a06a22223d6a5fd49a7eb139.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a70c0e9d65544456c8767f851a658088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37793a3a810e823e10c340986f55ddd.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a49de08c6527101927582945d6551bf.png)
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【推荐2】如图,在四棱柱
中,底面
和侧面
都是矩形,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/1cab666e-9ec1-474d-a893-464b61ec522d.png?resizew=170)
(1)求证:
;
(2)若点
的在线段
上,且二面角
的大小为
,求
的值.
![](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/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4eb75797c8d4fe030a15cc62e20272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526908dfb46cf151b8ab1492a9d52047.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/1cab666e-9ec1-474d-a893-464b61ec522d.png?resizew=170)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354e321ac9ab002db04261253b19ba9d.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d9f756419912dd298a0d6857130c80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b142f8f07d7a29789fcfde04a6b25713.png)
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【推荐3】在四棱锥S—ABCD中,底面ABCD为长方形,SB⊥底面ABCD,其中BS=2,BA=2,BC=λ,λ的可能取值为:①
;②
;③
;④
;⑤λ=3
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/5713d8ff-0229-43ab-b294-3e22cc542282.png?resizew=209)
(1)求直线AS与平面ABCD所成角的正弦值;
(2)若线段CD上能找到点E,满足AE⊥SE,则λ可能的取值有几种情况?请说明理由;
(3)在(2)的条件下,当λ为所有可能情况的最大值时,线段CD上满足AE⊥SE的点有两个,分别记为E1,E2,求二面角E1-SB-E2的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f83464bf17f9d4d9ee6a7f299539871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3cf0f585938ede9eca890a6eb326d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f88070c5772370fef9c16727145641d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0b6855ff38858f4c62013c46a0aa3bd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/5713d8ff-0229-43ab-b294-3e22cc542282.png?resizew=209)
(1)求直线AS与平面ABCD所成角的正弦值;
(2)若线段CD上能找到点E,满足AE⊥SE,则λ可能的取值有几种情况?请说明理由;
(3)在(2)的条件下,当λ为所有可能情况的最大值时,线段CD上满足AE⊥SE的点有两个,分别记为E1,E2,求二面角E1-SB-E2的大小.
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