如图,四棱锥
的底面是正方形,
底面
,
,点
分别在棱
上,且
平面
.
![](https://img.xkw.com/dksih/QBM/2017/9/14/1773845116493824/1774644741488640/STEM/8595d77b80d64499bf00128dc1da6c04.png?resizew=169)
(1)求证:
;
(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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb46aaae98bce8e66848e09c2c1cdbd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
![](https://img.xkw.com/dksih/QBM/2017/9/14/1773845116493824/1774644741488640/STEM/8595d77b80d64499bf00128dc1da6c04.png?resizew=169)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9110da5b5551c93e312b5ba97cb682cd.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06fb3c575a50f550e8ff6efd812768b1.png)
更新时间:2017-09-15 17:06:52
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图所示,几何体
中,
均为正三角形,四边形
为正方形,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
平面
,
,M,N分别为线段
与线段
的中点.
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975762628812800/2975843725754368/STEM/6e82fbd5-4e22-40a3-9d51-434f2e594022.png?resizew=311)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7281fb299ccf1adfb9de560fd0984edb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eacacbe79172aa2cc32fdd574955c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f3e3b28c0f8c2f54aad1d8a7fc40a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975762628812800/2975843725754368/STEM/6e82fbd5-4e22-40a3-9d51-434f2e594022.png?resizew=311)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e106f4233be16e98f2c1bf9f1635622.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6760f565c694d1cdb6d7068e14526d00.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐2】已知四边形
为直角梯形,其中
,
且
,
.现将三角形
沿直线
折起,使得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/4bc24bad-3148-4f70-a42a-db85551d5564.png?resizew=344)
(1)求证:平面
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/086b195fa3c01695809ba94ddf0261aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80333568e65e6534c6d2e582f9dd0a47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c18f9acb7018337a961eed6358eeaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ea6d39197c8f7159c37644f2f0fc78.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/4bc24bad-3148-4f70-a42a-db85551d5564.png?resizew=344)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c0b2a4616dbc8c104bbb1cf9ec211d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c65321aa3b63016dad6dbbc625b0e0f.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐3】如图所示的多面体中,底面
为正方形,
为等边三角形,
平面
,
,点
是线段
上除两端点外的一点.
![](https://img.xkw.com/dksih/QBM/2020/4/7/2436589852803072/2436852788879360/STEM/5daa7af984484cb2bfe8d592b9533155.png?resizew=186)
(1)若点
为线段
的中点,证明:
平面
;
(2)若二面角
的余弦值为
,试通过计算说明点
的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8191fde3b34e29480c2efb3e5416988a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa3c61d6c19e187b4b824b6f5610cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e247dd7f1633b517046e65f1f54399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
![](https://img.xkw.com/dksih/QBM/2020/4/7/2436589852803072/2436852788879360/STEM/5daa7af984484cb2bfe8d592b9533155.png?resizew=186)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95475bfc06e884754eb4a455c3f434e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02760ff3f69823422236f73890e484d7.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61ff2b90601d9bf500a01bff2fba615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e468f168f3657d84d44be5eb89a62d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
解题方法
【推荐1】如图,四棱锥P—ABCD的底面ABCD是边长为2的正方形,PA=PB=3.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/e07fc358-29c3-424e-bd4d-84bff10c3464.png?resizew=104)
(1)证明:∠PAD=∠PBC;
(2)当直线PA与平面PCD所成角的正弦值最大时,求此时二面角P—AB—C的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/e07fc358-29c3-424e-bd4d-84bff10c3464.png?resizew=104)
(1)证明:∠PAD=∠PBC;
(2)当直线PA与平面PCD所成角的正弦值最大时,求此时二面角P—AB—C的大小.
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐2】如图,在三棱柱
中,
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/22/bf82e2bc-83f6-438d-a1d2-e319e78f62f4.png?resizew=207)
(1)求证:
;
(2)若
,直线
与平面
所成的角为
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78f521b2a852e44bee4c553251d37d44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/22/bf82e2bc-83f6-438d-a1d2-e319e78f62f4.png?resizew=207)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7870cee007535b979d35bc7feab75616.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ee950f7e202d647d53efa55d48e01b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996bf3d35b6763cbc1a423b13a9df2dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/513d1fb90e198a552a61d535187a2fe5.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐3】马戏团的表演场地是一个圆锥形棚,如图,
为棚顶,
是棚底地面的中心,
为棚底直径,
,
是棚底的内接正三角形,中间的支柱
米,从支柱上的
点向棚底周围拉了4根绳子
供动物攀爬表演,有一个节目表演的是猴子从
点沿着绳子
爬到
点,再沿着
爬到棚顶,然后从棚顶跳到
中的某一根绳子上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/cf507ce4-ee84-41cc-84f5-4fe0841b5f99.png?resizew=176)
(1)当
点取在距离
点
米处时,证明拉绳
所在直线和平面
垂直;
(2)经验表明当拉绳
所在直线和平面
所成角的正弦值最大时,节目的观赏性最佳,问此时应该把
点取在什么位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22538f4c49c5a0f1b1cf59773c218bd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d3c54b33e6ec883393f6630000446d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c7267e5313b9b00ef22c94a479fc34.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/cf507ce4-ee84-41cc-84f5-4fe0841b5f99.png?resizew=176)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed0325097927b92a6458bfbb0667b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)经验表明当拉绳
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐1】如图,空间四边形
中,
是正三角形,
是直角三角形,点
、
分别是
、
的中点,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/8414ef27-32dd-4547-b35e-ffd5e5685b84.png?resizew=155)
(1)求证:
平面
;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ecb138a844ef11bb3214cff0a475c9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5fc4ad65b723b6a8da4c8dac154e6e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/8414ef27-32dd-4547-b35e-ffd5e5685b84.png?resizew=155)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa3c61d6c19e187b4b824b6f5610cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐2】如图所示,在四棱锥P-ABCD中,PA⊥底面ABCD,AB⊥AD,AC⊥CD,∠ABC=60°,PA=AB=BC,E是PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/a50c5807-f76f-4264-a768-474742e199c2.png?resizew=164)
(1)求证:AE⊥平面PCD;
(2)求PB和平面PAD所成的角的大小;
(3)求二面角A-PD-C的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/a50c5807-f76f-4264-a768-474742e199c2.png?resizew=164)
(1)求证:AE⊥平面PCD;
(2)求PB和平面PAD所成的角的大小;
(3)求二面角A-PD-C的正弦值.
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
解题方法
【推荐1】如图,
为矩形
的边
上一点,且
,将
沿
折起到
,使得
.
![](https://img.xkw.com/dksih/QBM/2020/3/29/2430054929588224/2430691269771264/STEM/756e6d1d-4503-471b-9ddf-b8187af81631.png?resizew=535)
(1)证明:平面
平面
;
(2)若
,求平面
与平面
所成的锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db203a75be4335050febf55bc53d596.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c64eccc16ed45719b12a3102ecb6107b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee4be3de004ff79180a692da40cd3267.png)
![](https://img.xkw.com/dksih/QBM/2020/3/29/2430054929588224/2430691269771264/STEM/756e6d1d-4503-471b-9ddf-b8187af81631.png?resizew=535)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a832b538d0bd5a0051d485fae371a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd6667173aa47d505361eb67d5c4000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b12cffc313a181f666e3fc8e66b6f59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1530d93834fbafba5f7217778ea90442.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,四棱锥
中,四边形
是矩形,
平面
,E是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/30/61d58522-2785-4a91-990b-4133d5767756.png?resizew=253)
(1)若
的中点是M,求证:
平面
;
(2)若
,求平面
与平面
所成二面角的正弦值.
![](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/cd654221ab95fe241d9e0202443f2609.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/30/61d58522-2785-4a91-990b-4133d5767756.png?resizew=253)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0285afe567ca0b32f0ccafc30167cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf7a6136d00ddeac84741ba77fea340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9068f29d671d76d1e95ba3a4eaff5b96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐3】如图在直棱柱
中,
,
、AC、
的中点分别为D、E、F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/a8d5333c-9625-4300-8376-ca0ab24ecbd9.png?resizew=157)
(1)求证
平面BEF;
(2)若异面直线
与BF所成的角为
,且BC与平面BEF所成角的正弦值为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8093ef6d1cb64d41f037f4f01b69c627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2cdcd37664377755e38dcfc7cd69f3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaf8ddee132d4aee6be2bc73854d3f28.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/a8d5333c-9625-4300-8376-ca0ab24ecbd9.png?resizew=157)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
(2)若异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e3ba0a7f71d26007dab1b28646ded9.png)
您最近一年使用:0次