如图,在
中,
,P为
边上一动点,
交
于点D,现将
沿
翻折至
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/8a9365f5-fd24-4bfb-a2e5-ef08bc02456b.png?resizew=166)
(1)
沿
翻折中是否会改变二面角
的大小,并说明理由;
(2)若
,E是
的中点.求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
平面
,并求当平面
平面
时四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b8f015217b0d485e6fd1da3802084c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8fe4026f1a0745ab9aa9fe64f0e482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4a237d3269ed2ebb073c5741c41915a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/8a9365f5-fd24-4bfb-a2e5-ef08bc02456b.png?resizew=166)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8fe4026f1a0745ab9aa9fe64f0e482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcccbe157f2ff20e323716205096514.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36177d3114fd41fa976b7d2ae780f1a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58fb3f6c9c7adfd62c9802aecff8bdc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88d94f16de1e3952535f9c6cd2eae28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4864c21e9664fa9111ede6425b09563a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64abc0befb2318656cdacbb69e575693.png)
更新时间:2023-04-26 07:15:16
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在四棱锥
中,
//
,
,
,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a0cc1a450f1f05c5621efdf00b0f91.png)
平面
,点
在棱
上.
(1)求证:平面
⊥平面
;
(2)若直线
//平面
,求此时三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbb2dce15f3d0fe839688575d2a8ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923718ac7b296dd2c3b5b1d8ea0c3b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a0cc1a450f1f05c5621efdf00b0f91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/c1142ec4-b498-4904-a1a1-1b72cf935f2a.png?resizew=185)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af29254fe60a392c249c5791279e9c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e76f6552e20faeba98588e9b5dd01f6e.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,四棱锥
中,四边形
为正方形,
,
分别为
,
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/330e3949-6300-4695-9588-6ada2b344daf.png?resizew=125)
(1)证明:
平面
;
(2)已知
,
,
,求三棱锥
的体积.
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/330e3949-6300-4695-9588-6ada2b344daf.png?resizew=125)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94270844f197d524bf1da4f1385befd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6c2dad46a9052a4185a4f7b4ae8a2e.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142b5bb5452fa06ab3d0d556ae1b9088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3af4a22289b4d4575fbb838f09637416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbb2dce15f3d0fe839688575d2a8ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb6b4a013c15ce1c166166fc30355af.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,正三棱柱
的底面边长是2,侧棱长是
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/7a92e283-f5a1-4150-b365-d4c09c57ece8.png?resizew=205)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/7a92e283-f5a1-4150-b365-d4c09c57ece8.png?resizew=205)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504a36c231b8e80724d01649e7c0944f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c6e83a7ba71f5692083bc3a1bbc407c.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】已知点
为正方形
所在平面外一点,
,
、
分别为
、
上的点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/3/214e16d4-e318-4f0f-b759-5972f04113f0.png?resizew=152)
(1)求证:
平面
;
(2)求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1116bfae5ca61cc796deb4dc2dc80931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784bf07e745ca00fc0f8e8f4c0343b77.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/3/214e16d4-e318-4f0f-b759-5972f04113f0.png?resizew=152)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在直三棱柱
中,
,
为棱
上靠近
点的三等分点,
,
.
(1)证明:
;
(2)求平面
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7eb58cf1ca6703e4bba7c821b41a607.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/24/f79d02ae-aad4-4156-adb1-a13ebdaa5caf.png?resizew=148)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/993830e5de2bbf858071d375bbf186f8.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,三棱锥P﹣ABC中,底面ABC为正三角形,PA⊥平面ABC,AG⊥平面PBC,垂足为G.
![](https://img.xkw.com/dksih/QBM/2021/4/29/2710103399251968/2711889466515456/STEM/a52c969e-b3a5-4857-bd85-c8afc4bb6b0d.png?resizew=209)
(1)问G是否可能是△PBC的垂心?说明你的理由;
(2)若G恰是△PBC的重心,求直线BC与平面ABG所成的角.
![](https://img.xkw.com/dksih/QBM/2021/4/29/2710103399251968/2711889466515456/STEM/a52c969e-b3a5-4857-bd85-c8afc4bb6b0d.png?resizew=209)
(1)问G是否可能是△PBC的垂心?说明你的理由;
(2)若G恰是△PBC的重心,求直线BC与平面ABG所成的角.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】如图,四棱锥
中,
,
,
与
都是等边三角形,且点
在底面
上的射影为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/4f066367-f506-424f-ae35-4fa8ebdb3965.png?resizew=228)
(1)证明:
为
的中点;
(2)求异面直线
与
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4117625867a74cd022584500c76deca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9d442baaaffc60c8f0af37ec5182f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929d467300252d809d8c88e4885bc7b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781e6927e3bc512359dc8b0c11e195d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1cbf03524f866cc66d019a01e7c4284.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/4f066367-f506-424f-ae35-4fa8ebdb3965.png?resizew=228)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
【推荐1】如图,四棱锥
中,
为正三角形,
,
,
,
,
、
为棱
、
的中点.
![](https://img.xkw.com/dksih/QBM/2018/2/13/1881282005393408/1883724934488064/STEM/d44737c2a4b641c59b2a63790318bb31.png?resizew=140)
(1)求证:平面
平面
;
(2)若
,直线
与平面
所成角为
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e2903ff33266528a7902ad51cf8d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12143a06ed24558d8cc7ad39961d3e1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfead9301eebcabcc83d5f122062f558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44f4120c94cb7176dc31fcac387b32e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/2018/2/13/1881282005393408/1883724934488064/STEM/d44737c2a4b641c59b2a63790318bb31.png?resizew=140)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6240d4cf0fb44aa1e6bdaf2a4bdfb37e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e443e8220f59767d864e53f89bca8b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
您最近一年使用:0次
【推荐2】如图,在三棱柱ABC﹣A1B1C1中,四边形ABB1A1为正方形,且AC=AA1=4,∠CAB=∠CAA1=60°.
![](https://img.xkw.com/dksih/QBM/2020/9/8/2545304737710080/2546104574459904/STEM/fe3832dfca54462b8c59d0c481b6e7ff.png?resizew=248)
(1)求证:平面AB1C⊥平面ABB1A1;
(2)求点A到平面A1B1C的距离.
![](https://img.xkw.com/dksih/QBM/2020/9/8/2545304737710080/2546104574459904/STEM/fe3832dfca54462b8c59d0c481b6e7ff.png?resizew=248)
(1)求证:平面AB1C⊥平面ABB1A1;
(2)求点A到平面A1B1C的距离.
您最近一年使用:0次