1 . 折扇又名“纸扇”,是一种用竹木或象牙做扇骨,韧纸或者绫绢做扇面的能折叠的扇子,折扇的扇面自古以来就是文人墨客喜爱的诗画载体.图2中扇形
是图1中扇面的平面图,其中
.如图3,某书画家计划在该扇形内取一个矩形
进行绘画或书写以抒情达意,设点
为弧
的中点,扇形半径为1,
,记矩形
的面积为关于
的函数
.
的解析式,并指出当
为多大时,
最大;
(2)令
,若
在区间
上有两个零点,求实数
的取值范围;
(3)若
为扇形
中
上的一个动点,且
,其中
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff5c21185c13eae675906dabd3593c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52bdd7b8a0dcc06988320f476956f8f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4920b6731fc1580a46dad9ca40609d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d51992c05a557cf6058664f1f8961e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37dd0802f896556180545ae356e90c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa72c594ebe33496fa7b9edf1db5c7e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febf7413b35cf2889fdb57a6b519087c.png)
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2 . 已知函数
的一部分图象如图所示.下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6309e18f51f43800c0a16205c6a491b.png)
A.函数![]() ![]() |
B.![]() ![]() |
C.![]() ![]() ![]() |
D.当![]() ![]() |
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3 . 设
,则“
”是“
”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45a173784888adf2946382fa093ba53a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd754bbf05bd6d7eefcdb28c6602a98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edaec4736d17022aca544401d1eba36b.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
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4 .
的一般结构是
.站在三角换元的角度,就是利用同角三角函数中的平方关系,对代数式中的两数和或平方和为常数的结构进行三角代换以挖掘代数式中的隐含条件来解决问题.研究函数
,求出
的值域是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2302bd8fbae724ad0aa0dd1a2c318968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d8cc033b39e6328fa6c478bdb5c7a6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51cbb353e903b72f2e59f025a8e3179f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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5 . 已知命题
:
,
,若命题
是假命题,则实数
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a9d2e09a20d4ad63382a72d58f2ccf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4b3077b330c7decb8f603671b80c44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
6 . 正方形
的边长为6,
,
分别为线段
,
上的动点.
(1)若
是
的三等分点
,求
的值;
(2)当点
在
边上运动时,始终保持
,当点
运动到什么位置时,线段
最短.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c330983114d20b630093055ac267db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/146c183051f41ac154a9ff4d74d3d5cc.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce726bceb02452bb4e5ed6b00fa94e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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解题方法
7 . 计算
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d6b6146cabedabc9862e4e19cd19b4f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
8 . 已知斜三角形
.
(1)借助正切和角公式证明:
.
并充分利用你所证结论,在①②中选择一个求值:
①
,
②
;
(2)若
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(1)借助正切和角公式证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f846e5859aab52461b125a83652ec9.png)
并充分利用你所证结论,在①②中选择一个求值:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7798db106b4bed40fd7b43a9eaeb463.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6508e636cfd77c0a0406b3fbf3b70213.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5cc19955c1f24f90d36c68aba23bebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a30f03a31c8a873bfcf7287e45b6c6a0.png)
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9 . 已知函数
的图象如图所示,则下列正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1fe33333a7b288483b94dc0b28317e.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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解题方法
10 . 如图,在正方形ABCD中,点E是AB的中点,点F,G分别是AD,BC的二等分点.
(2)已知对任意平面向量
,把
绕其起点沿逆时针旋转
角得到向量
,叫做把点N绕点M沿逆时针方向旋转
角得到点P.已知正方形ABCD中,
,点
,把点B绕点A沿顺时针方向旋转
后得到点P,求点P的坐标.
(2)已知对任意平面向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5507678a16df4180ef2cd011047083a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a014dff8997c661055229de29c61cfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e287cdafccfdf029423546309679f07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/131ebfee8d3fd5d0c4d3b20012e232f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae3dd032b16a9730fb66544ff4fd3a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
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