名校
解题方法
1 . 在
中,满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e0bb1473c51c87c01d4c9bcacbc30b8.png)
(1)求
;
(2)若
,边
上的中线,
,求
的周长和面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e0bb1473c51c87c01d4c9bcacbc30b8.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3396625ea2762033b5d8bdd3f56f8797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7650cede07c4758a9b3bb1da4553acc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解题方法
2 . 如图, 在
中,
为
的中点,
,
与
交于点
,若
,则下面对于
的描述正确的是( )
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/122fe84cfa345c1902231699c96beac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833d37b9c21319f3965bb4d19c9ebe72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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3 . 在四棱锥
中, 底面
是边长为2的正方形,
平面
.
;
(2)若
与底面
所成的角为45°;
①求点B到平面
的距离;
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/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/cb5d56d8170b764b80a672cd6c861921.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
①求点B到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
②求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69076a8440ebd8d01106579c7b5bce62.png)
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解题方法
4 . 如图,二面角
等于
,
是棱
上两点,
分别在半平面
内,
,
, 且
则
的长等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb9f6f75005ab8e946e7195afaf44c59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504b434a5d06fa23809a709fa42da886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cf464ac1bfdd9bb59f9ab4d55ad2667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c638fb895acd987140d0ca6bef097499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0a2d7d40a6c0bf1fddb802db381689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43cef00fc08e3ca1da8f78d7a742ee75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
A.4 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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解题方法
5 . 已知△ABC的内角A,B,C所对的边分别为a,b,c,下列四个命题中正确的命题,( )
A.若![]() ![]() |
B.若![]() ![]() ![]() |
C.若![]() |
D.若![]() |
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解题方法
6 . 已知a,
,
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19339e3904e9541ff26b30ae5f1242b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/face6e089750217066154a1869f69cbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d540ecfc350c260be2fcc7ba3eef80.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
7 . 在△ABC中,
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fadd2e6f0aa16c2c466c904474ffc79c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec6118916717a5b01199a6876da4a72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54a36173cd9b7b28e91619d715cb569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/facd1fcfad659e95da18c38e5eb157b8.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
8 . 已知函数
,则不等式
的解集为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e16eaf154c6eb78e4c1b19e6aa1f0fc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ad269224cb110b03a9b62b090b4d10.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
9 . 如图,已知单位圆O与x轴正半轴交于点M,点A,B在单位圆上,其中点A在第一象限,且
,记
,
.
,求点B的坐标;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed367b88668d973e54bbae632e92c628.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c99a08b2ba8ee9e68f6b589f77c021.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/320adeae8baedfbd537112863592aae3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a12a3528cc8d89044fd2c96b3ac542a7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/007be05ef03960b5278fcb46cfc70ff0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a3befe81f901f6f378196a928f84e21.png)
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10 .
的内角
,
,
的对边分别为
,
,
,则下列结论正确的有( )
![](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)
A.若![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() ![]() |
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