如图,在四棱锥
中,底面
为正方形,
为等边三角形,侧面
底面
,点
满足
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/b874c3ed-d9d4-4f6f-967d-f1f6fd3e67be.png?resizew=165)
(1)当
取何值时,
;
(2)在(1)的条件下,求平面
与平面
夹角的正弦值.
![](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/36aae82d53f2a35d2f95f467bd5b76cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ad6a0124359e8b9f7649cf0bff51ab.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/e699f6e1923284a5eecdc897bfbc2337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/540ccd15435aa2d59e809d6a28fb2467.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/b874c3ed-d9d4-4f6f-967d-f1f6fd3e67be.png?resizew=165)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30987c1ff8b2cc69bb6ad6c41bde18b.png)
(2)在(1)的条件下,求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
更新时间:2023-01-08 08:57:53
|
相似题推荐
解答题-问答题
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适中
(0.65)
名校
【推荐1】在平面向量中有如下定理:已知非零向量
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715424930a93f29dd7e0ade85d782abb.png)
(1)拓展到空间,类比上述定理,已知非零向量
,
,若
,则___
请在空格处填上你认为正确的结论![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)若非零向量
,
,
,
且
,
①利用(1)的结论,求当
时,求
的值,
②利用(1)的结论,求当k为何值时,
分别取到最大、最小值?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21622782a1b33b3be43d7824ac5f1c82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7917464c0138a5fde64680a966573f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715424930a93f29dd7e0ade85d782abb.png)
(1)拓展到空间,类比上述定理,已知非零向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3619a3f526eca4e29fd3edc6bd485f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8383f8f4d22147a863c687f7c99798d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a301324443eb93b467134a86890dd9ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)若非零向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80ea38931261a942bed5fdaee83a75c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b9503aadc76a4d1662b7ee9641b42dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b9fa4da98bf9cc404ca1ef8fed6add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a36228810d0c2f6c6e53584c1ac176b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc523bdaf222089feb5befd43753ed7.png)
①利用(1)的结论,求当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a882037b9ce104ecc496e0f31a139361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b6859d25bbd00d4f12ffa02e87c51d.png)
②利用(1)的结论,求当k为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b6859d25bbd00d4f12ffa02e87c51d.png)
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【推荐2】如图,四棱锥
中,
为等边三角形,平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
底面
,底面
为直角梯形,其中
,
,
,
为线段
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/3bb7d04a-e582-420b-91fe-e9f4664edb49.png?resizew=205)
(1)证明:
平面
;
(2)求平面
与平面
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.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/405effb49ef901476701e72cc47918da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8745717601cd14b46c2298919b41b502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/3bb7d04a-e582-420b-91fe-e9f4664edb49.png?resizew=205)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0edb1508fc95765f3bb316bcb5252d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb304d905125170bebfada27e7ed8960.png)
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解答题-问答题
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(0.65)
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【推荐1】如图,直三棱柱
中,
,
,
,点
是
的中点,点
在
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/2f2d652f-b7db-4d42-ab66-246f5149e166.png?resizew=149)
(1)求
与平面
所成角的正弦值;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede6a60cad0e0b58e1549fda6e085719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82da6815bc213dfd78c2f77cd7ded8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c47b3e7435856bedf495e1e859be631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836656903472b8c20a2ddd5413474f1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c640abbdc470479407da1ae2aa80fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c75282fd7e545e2fc96183ac7b0885fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/2f2d652f-b7db-4d42-ab66-246f5149e166.png?resizew=149)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10eda7896701f1e9cd5d829cf91b4946.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d69d744440d42a745403aca8c1c1af4.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/300f48c1576993c805ad63b328c9d024.png)
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【推荐2】如图,在四棱锥
中,底面ABCD是矩形,
平面ABCD,
,
,点E是棱SD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/68ae11ba-59f3-4241-bd8b-c709a3f9bf21.png?resizew=181)
(1)求异面直线CE与BS所成角的余弦值;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37505861cb6bd5dd3c95da992510c3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f69c2c6e4bd53298288406d7046abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/68ae11ba-59f3-4241-bd8b-c709a3f9bf21.png?resizew=181)
(1)求异面直线CE与BS所成角的余弦值;
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324d453870b345da0c41977290192f94.png)
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