如图,在四棱锥
中,底面
为等腰梯形,
,
,
面
,
,点
为线段
中点
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/28/a4944444-e3b5-4ffc-a3e2-8e8701bdb51c.png?resizew=140)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
面
;
(2)求异面直线
与
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e0b64d25ddd18454f88e40c45d7d8f.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/39c049bbf873a6af116712840484b98f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/28/a4944444-e3b5-4ffc-a3e2-8e8701bdb51c.png?resizew=140)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
更新时间:2022-06-24 05:27:44
|
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解答题-问答题
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较易
(0.85)
解题方法
【推荐1】三棱台ABC﹣A1B1C1中,AA1⊥平面ABC,∠BAC=90°,AB=
AA1=2A1B1=2A1C1.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/d5a238c8-fc17-4c18-9ab0-730a564fda6e.png?resizew=135)
(1)证明:AB1⊥BC1;
(2)求AC1与平面A1C1B所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7881094ce2f907c3aaf664318ecd3e2d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/d5a238c8-fc17-4c18-9ab0-730a564fda6e.png?resizew=135)
(1)证明:AB1⊥BC1;
(2)求AC1与平面A1C1B所成角的正弦值.
您最近一年使用:0次
解答题-问答题
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较易
(0.85)
解题方法
【推荐2】如图所示的几何体中,四边形
是等腰梯形,
,
,
平面
,
,
.
(1)求二面角
的余弦值;
(2)在线段AB(含端点)上,是否存在一点P,使得
平面
.若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b5a90e556da12d63b7f481bd8e874c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bfd2256428e748c07e743e751d26480.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/5/b1bdcfb5-92cb-4ddf-a85a-f91e2c622c3b.png?resizew=152)
(1)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26bd9e6b1ef5ea610e0e9a2a4eff4a94.png)
(2)在线段AB(含端点)上,是否存在一点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd553b360feed77920ce7d36aee3eca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ab40260ac9056153d14d70d2519371.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
解题方法
【推荐1】如图,在平行六面体
中,
,
,
,
,求
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd21a4e45dc1beb069d7e78f84a51544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd9d019049d674199cde7f64e65bbc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0f0ccc8492a0ccf1eee24867060643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a037b1a3ec2e37bbcb05d0a467efb511.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
名校
【推荐2】如图,在四棱锥
中,底面
是菱形,
平面
,
,
、
分别是
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/7cbd84e2-dbd5-48d8-a2ed-91febb952233.png?resizew=164)
(1)求证:
平面
;
(2)求异面直线
与
所成角的大小(结果用反三角函数值表示).
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f9dcef8452c2f84120eb7422a5e337e.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/7cbd84e2-dbd5-48d8-a2ed-91febb952233.png?resizew=164)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6c2dad46a9052a4185a4f7b4ae8a2e.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
您最近一年使用:0次