解题方法
1 . 如图,
,
,
,且
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/2b668d07-f8b8-4372-9b92-c4abc646ad1f.png?resizew=130)
①![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dde3e8cbf51db7d335f155eb81eae00.png)
________ ;
②线段BD与平面
所成角的正弦值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9934483d3f6ceb7fd9f6ea8a2747940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa8089ef4b9af6a9c54fb8316837aee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915e8e775538d41debf1933102c6b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de11e90e1c0c3a5cb00f6d73710cf24a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/2b668d07-f8b8-4372-9b92-c4abc646ad1f.png?resizew=130)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dde3e8cbf51db7d335f155eb81eae00.png)
②线段BD与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
名校
2 . 如图,正方形
的边长为2,
,
分别为
的中点,
与
交于点
,将
沿
折起到
的位置,使平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/d0cc6889-a885-4280-9e83-9aa5e3fc17fa.png?resizew=412)
(Ⅰ)求证:平面
平面
;
(Ⅱ)求二面角
的余弦值;
(Ⅲ)判断线段
上是否存在点
,使
平面
?若存在,求出
的值;若不存在,说明理由.
![](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/e18de69c62ddb28098b7688a3d724750.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f201a40fedca4ad14db193f4db2127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e8aeeb74aa3281549eae995ffd5e1ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004dd8ad9e5a200b3869ebfc59c2446d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cdacfb280b8545f20de32d533eecb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/d0cc6889-a885-4280-9e83-9aa5e3fc17fa.png?resizew=412)
(Ⅰ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7819aad781c70ab514e10032acb777c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8035fc825a001d7d9a3dacd8271662.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e014634a74ebc89f51ca225f1087f4cb.png)
(Ⅲ)判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06fb58b1f186b54fd5709d61c7302ff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641d9688e81760c02d0dfc4ba015afb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98d2f2cc97aa19f204861742af2f9ba9.png)
您最近一年使用:0次
2019-04-17更新
|
631次组卷
|
2卷引用:【区级联考】北京市大兴区2019届高三4月一模数学(理)试题