如图(1)示,在梯形
中,
,
,且
,如图(2)沿
将四边形
折起,使得平面
与平面
垂直,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/31/d8900cc4-01f2-468a-b337-f1917f08da38.png?resizew=252)
(1)求证:
面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc58a5339fe17858661b69883567636.png)
(2)求证:
;
(3)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f90126f831d6600522ecaa66c2a8b9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbcc0752fae478b2a8ea6f37acbef5c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca62001f03424f892c0827ba05faec47.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/31/d8900cc4-01f2-468a-b337-f1917f08da38.png?resizew=252)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963a91995abd4927d75406d16e10a81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc58a5339fe17858661b69883567636.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7e284eac4b90bfb327de768a7beef6.png)
(3)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
更新时间:2023-11-29 16:24:02
|
相似题推荐
解答题-证明题
|
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(0.85)
【推荐1】如图,在底面为平行四边形的四棱锥
中,
,
平面
,且
,点
是
的中点.
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571946720264192/1571946726064128/STEM/fecc13c3-1a9f-4d9c-a8ef-aaa2d8d1a7a8.png?resizew=153)
(Ⅰ)求证:
;
(Ⅱ)求证:
平面
;
(Ⅲ)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571946720264192/1571946726064128/STEM/fecc13c3-1a9f-4d9c-a8ef-aaa2d8d1a7a8.png?resizew=153)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbd7c2767c106faf27d6a97ebc8e739.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】如图,在三棱锥
中,
分别为
的中点,且
为等腰直角三角形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/d557b292-6080-4933-9900-b573e8e11cb1.png?resizew=144)
(1)求证:
平面
;
(2)求异面直线
与
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e83fd42df335c85bf92b7961b9851977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ace5e8c3769ad8f370c86f879246c174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc6b94f23607ff4261c371ec9425c8f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/d557b292-6080-4933-9900-b573e8e11cb1.png?resizew=144)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/604c52089e01ac5ab3f14125f9b06de1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解题方法
【推荐1】如图,四棱锥
中,平面
底面ABCD,
是等边三角形,底面ABCD为梯形,且
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/3ef54571-0ce4-45a2-a19e-d531d46feedc.png?resizew=177)
(1)证明:
;
(2)求A到平面PBD的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ad6a0124359e8b9f7649cf0bff51ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36aae82d53f2a35d2f95f467bd5b76cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa3f8ecc57e62a8ef9b5be34ea6c963c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/3ef54571-0ce4-45a2-a19e-d531d46feedc.png?resizew=177)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5d56d8170b764b80a672cd6c861921.png)
(2)求A到平面PBD的距离.
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【推荐2】如图,菱形
的边长为6,对角线交于点
,
,将
沿
折起得到三棱锥
,点
在底面
的投影为点
.
![](https://img.xkw.com/dksih/QBM/2021/4/27/2708935073275904/2710416684392448/STEM/0e27a404-f73a-4824-8f9a-429bbfbf6404.png?resizew=543)
(1)求证:
;
(2)当
为
的重心时,求
到平面
的距离.
![](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/e13c772461aef1d9d715129636739748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2021/4/27/2708935073275904/2710416684392448/STEM/0e27a404-f73a-4824-8f9a-429bbfbf6404.png?resizew=543)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
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解答题-作图题
|
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名校
解题方法
【推荐1】如图,在三棱锥
中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/68e3da10-b124-4ae1-96ab-6ef6e16e68d1.png?resizew=243)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/f5b1547a-91e7-45b6-9374-0e6c724a5534.png?resizew=276)
(1)根据图中所给主视方向,在下列方格纸(方格的单位长度为1)上已画出该三棱锥的主视图,请画出该三棱锥的左视图和俯视图;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5ae8a050d7159d4296c2409e5bc0bf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7898f562dffdf08263bfb0873e0691.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364d6c88726d8c3bb8ed297057332bac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/68e3da10-b124-4ae1-96ab-6ef6e16e68d1.png?resizew=243)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/f5b1547a-91e7-45b6-9374-0e6c724a5534.png?resizew=276)
(1)根据图中所给主视方向,在下列方格纸(方格的单位长度为1)上已画出该三棱锥的主视图,请画出该三棱锥的左视图和俯视图;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a15a004f7d47ed595f063e60075223a.png)
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【推荐2】如图,在四棱锥
中,底面
为菱形,
,点
在线段
上,且
,
为
的中点.
(Ⅰ)若
,求证:
;
(Ⅱ)若平面
平面
,
为等边三角形,且
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc907cbc584e5f9c62c0ba8e9133bf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a34a1a0354e836d4c88eeb7d2589283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/961f282bbe9a9599c25e297139b0ab27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8f1796428c2600bbbdff746b0311583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcd98ee0037900264471b4baa7e46e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5d752b4b348baf68d334552ae54a32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b2a8c80bc574fc27cb32dcb06c6679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3686a991fb2ba017a6890bc6208e8a9.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d91cab64777fa1a17909fff7ac191c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76eaccd90ae5640af1a4796ffd18456.png)
(Ⅱ)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e482b51b3ffa1ad0187f00dbaaa220aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a34a1a0354e836d4c88eeb7d2589283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913b6662e44eb5cab8b892873a00c0ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf435f85883d2db2430a5b7bf41dab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e73bf2a7d4ec3595b83b461b869b8e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/c56202f3-d99c-47b9-ac9c-ad39d57ac5a7.png?resizew=163)
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【推荐1】如图,
中,
,
是正方形,平面
平面
,若
、
分别是
、
的中点.
(1)求证:
∥平面
;
(2)求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6321a96e7f0768394f6932a121adc84e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5352d28609d1b3d09a0a29d023d1bb72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/20/30978d16-29fa-47c0-9501-0b4b46c22b8a.png?resizew=131)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39282bdf319f30d7bc261e2e3ab3b1e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
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【推荐2】如图所示,四棱锥
的底面是正方形,平面
平面ABCD,点M是棱PA的中点.
![](https://img.xkw.com/dksih/QBM/2022/5/25/2987010527412224/2988279555497984/STEM/f0e1eccb-227a-442a-9520-c39d7885f17b.png?resizew=160)
(1)若
是等边三角形,求直线CM和平面PAB所成角的正切值;
(2)若点E是棱BM的中点,点F在棱PD上,且
.求证:直线
平面ABCD.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://img.xkw.com/dksih/QBM/2022/5/25/2987010527412224/2988279555497984/STEM/f0e1eccb-227a-442a-9520-c39d7885f17b.png?resizew=160)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
(2)若点E是棱BM的中点,点F在棱PD上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18952f3e04d465e8b654619e9978053b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
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【推荐3】如图所示,在三棱锥
中,
与AC不垂直,平面
平面
,
.
;
(2)若
,点M满足
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e61620a272dada8d4b9a9fab6379dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbb05b8b630052ff544249ebd72d95d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d3e94fe16834409e7688a83fbf7d5ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b1c142967ed69606a3287ded01fcf9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68a7bf0da4f7c6f739d2e2461ad9b7.png)
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