如图,在四棱锥
中,
平面
,底面
为矩形,
,
,
为
的中点,
.请用空间向量知识解答下列问题:
![](https://img.xkw.com/dksih/QBM/2022/2/18/2919033044123648/2935400809611264/STEM/dc973872-9b6a-469a-b075-969907672a2f.png?resizew=139)
(1)求线段
的长;
(2)若
为线段
上一点,且
,求平面
与平面
夹角的余弦值.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c527cc1c57a471c1f8442aa9dcb84d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4486d52b6e410fd7b60428121d96cef.png)
![](https://img.xkw.com/dksih/QBM/2022/2/18/2919033044123648/2935400809611264/STEM/dc973872-9b6a-469a-b075-969907672a2f.png?resizew=139)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06fa0a286a55692e4263a5993b01580b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df0e2a0b9e504abfc28536d9854133d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564376a88fa74090de9f7694226a6184.png)
更新时间:2022-03-13 16:31:08
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【推荐1】(1)已知
,且
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(2)已知向量
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【推荐2】已知向量
,
.
(1)当
与
平行时,求实数
的值;
(2)当
与
垂直时,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e53ecd812a19f3c4061299116901e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0f77a2cc6cb2e7876bf92cb590b849.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d489c43eb011491d16393bfba6774c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b57d4b52fc04039f5a5f8c9c6163748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877cb99be948fc1f0b0937569aa099fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56c08c1d025f7f40129fe19536bcd422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,四棱锥
的底面是平行四边形,
,
,
,线段
与
的中点分别为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b96dce1ec94eb90c243b2eddb78476.png)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69677e8341a5d775d145f595daf08705.png)
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d05cf9c349a95b54fff7dffb062d31d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d612df37f456a9cb3a5fd5e1764b76a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb11dcd07c445b707bdaa47dcd728ecc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b96dce1ec94eb90c243b2eddb78476.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69677e8341a5d775d145f595daf08705.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4837d8adb8799a7a6b518729f2eb2a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/d6db0fdb-0078-44ba-8dcc-81ffade1daa1.png?resizew=223)
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(0.65)
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【推荐2】如图,在四棱锥
中,PA⊥平面ABCD,AD⊥CD,AD∥BC,PA=AD=CD=2,BC=3.E为PD的中点,点F在PC上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/4ebde41f-54d2-4067-b314-6eeecf568c04.png?resizew=204)
(1)求证:CD⊥平面PAD;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f88454ace46996b99361d18e76189cdc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/4ebde41f-54d2-4067-b314-6eeecf568c04.png?resizew=204)
(1)求证:CD⊥平面PAD;
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74011b64ff147ac2f10c36a11ac1b34d.png)
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