名校
1 . 在锐角
中,设角
,
,
所对边分别为
,
,
,
.
(1)求证:
;
(2)若
,
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f84a0099c7ef3665653eda28ba04a5.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65352567d20609ef444804df42d21a4e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e355dfe216245f3d14c713891588223e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd454e69236d3ece1583420fb552e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23725094c363fd158166a8698971694c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
您最近一年使用:0次
2017-04-13更新
|
586次组卷
|
2卷引用:2017届海南省海口市高三4月调研测试数学(理)试卷
名校
解题方法
2 . 如图,在三棱柱
中,底面
是边长为2的等边三角形,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/920a63cc-10d2-4367-bef2-4babe856ccba.png?resizew=164)
(1)求证:
平面
;
(2)若四边形
和
都是正方形,求多面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/920a63cc-10d2-4367-bef2-4babe856ccba.png?resizew=164)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd597851c0db4e4de4769e10e09383b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74bca84ad86c648d3bb20c8909c8da3f.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a89b167e964aecdf9836ec6de5a911f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08e793c52fdd16cc602eaf753964ec02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af10c8c2f8a65ebed645e560e24a887a.png)
您最近一年使用:0次
名校
3 . 如图所示,在四棱锥
中,底要
为平行四边形,
,
,
,
底面
,
为
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/68674844-cd27-4699-abc8-76357848801c.png?resizew=200)
(1)证明:
;
(2)求二面角
余弦值.
![](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/3b621b74fa78206cdc8b7c546304688f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0295460562cc916fe4c7d01627d447b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba4c15fb8fc3239d45bd4e7d8971f58e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6186fc8a54f772ec0a8122a1a097c6a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/68674844-cd27-4699-abc8-76357848801c.png?resizew=200)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b07e317ffe7859e81b42ef4970e344a.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87136d5f4908fa04dd99bc35a16f393.png)
您最近一年使用:0次
2017-04-13更新
|
571次组卷
|
2卷引用:2017届海南省海口市高三4月调研测试数学(理)试卷