解题方法
1 . 若
,且
,则
的最小值为__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802fa75154cf452b1ef578447c7035f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/038d16ba4a91aa98248eff66984253b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee4c25755e08df6c44fa0d2be441f709.png)
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解题方法
2 . 已知
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/600e76ddbe6bfc9bea030764f92d4361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15e976891142f43f8b63cbadf4a040fe.png)
A.![]() | B.1 | C.![]() | D.0 |
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3 . 如图所示,用一个不平行于圆柱底面的平面,截该圆柱所得的截面为椭圆面.得到的几何体称之为“斜截圆柱”.AB是底面圆O的直径,
,椭圆面过点B且垂直于平面ABC,且与底面所成二面角为45°,椭圆上的点
在底面上的投影分别为
,且
均在直径AB同一侧.
时,求
的长度;
(2)当
时,若下图中,点
,
,
,…,
将半圆平均分成7等分,求
;
(3)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3242d8806f57185a040a491d682a59f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d26ebb800066a7bce57213cd074005.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d26ebb800066a7bce57213cd074005.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e8f16691ef340b567bf118cabe5a6f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be6df6b7eefc9a144ce88c7d23b86c0.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c345907ebe27888332b1b44c666cc47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1282962a17a48a18edf733204054d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f3b97c217370c2b3d22e6738006cc2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c5b12d3f053de085d592e8119fa26c.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14ba4f7c90236105a7a2dfd460b78551.png)
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解题方法
4 . 若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff81171e8634ac56f678a245781517a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc903c19f7b3b0aa58cdb0cdb7b062a0.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 已知函数
.
(1)求
的最小正周期;
(2)求
的单调递减区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b95236b0bdb1794b7f93f2e4de44628.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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名校
解题方法
6 . 已知
中,内角
,
,
所对的边分别为
,
,
,则下列说法正确的有( )
![](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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7 . 已知函数
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/759c95f401b1179d312c864db360b45e.png)
A.![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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8 . 已知
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f7f71b5f8487992e601056e523af602.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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9 . 若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e304cf018473bb54edb166fcd6502b.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41088cbb19ba42ed7fba4c54302f1186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bfdb5f50c0514b2b7cb83b2c29407b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e304cf018473bb54edb166fcd6502b.png)
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名校
10 . 下列结论正确的是( )
A.![]() |
B.![]() |
C.若![]() ![]() |
D.![]() |
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