如图,扇形
的半径为
,扇形
的圆心角为
,
是扇形的内接矩形,设
.
![](https://img.xkw.com/dksih/QBM/2022/6/20/3005353409585152/3006085794725888/STEM/39a9a7d970ed4f2d92f30a8c3b6fe14e.png?resizew=184)
(1)求扇形
的弧长及面积;
(2)用
表示矩形
的面积
,并求当
为何值时,矩形面积最大及其最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134c3d2c318a33a82da4134dd17fa57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/867d00157025729b6a66380810466edc.png)
![](https://img.xkw.com/dksih/QBM/2022/6/20/3005353409585152/3006085794725888/STEM/39a9a7d970ed4f2d92f30a8c3b6fe14e.png?resizew=184)
(1)求扇形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
(2)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134c3d2c318a33a82da4134dd17fa57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
更新时间:2022-06-21 13:20:07
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【推荐1】一只红蚂蚁与一只黑蚂蚁在一个圆(半径为
的圆)的圆周上爬动,且两只蚂蚁均从点
同时逆时针匀速爬动,红蚂蚁每秒爬过
角,黑蚂蚁每秒爬过
角(其中
).如果两只蚂蚁都在第14秒时回到A点,并且在第2秒时均位于第二象限.
![](https://img.xkw.com/dksih/QBM/2021/1/19/2639389824835584/2639443404652544/STEM/b0ccc426b9c6438aa17379d6408d63b3.png?resizew=189)
(1)求
,
的值.
(2)两只蚂蚁的爬行速度保持不变,若红蚂蚁从点A逆时针 匀速爬行,黑蚂蚁同时从点A顺时针 匀速爬行,求当它们从点A出发后第一次相遇时,红蚂蚁爬过的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a3d448d4e52782ca2024411c5a11fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8748dc55e2f45bc37fc4d84d7310f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c5723e701ad787bcc873829bff6c89.png)
![](https://img.xkw.com/dksih/QBM/2021/1/19/2639389824835584/2639443404652544/STEM/b0ccc426b9c6438aa17379d6408d63b3.png?resizew=189)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(2)两只蚂蚁的爬行速度保持不变,若红蚂蚁从点A
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【推荐2】如图所示,某风景区在一个直径AB为400m的半圆形花园中设计一条观光路线,在点A与圆弧上一点C之间设计为直线段 小路,在路的两侧 边缘种植绿化带;从点C到点B设计为沿圆 弧BC的弧形 小路,在路的一侧 边缘种植绿化带.(注:小路及绿化带的宽度忽略不计)
![](https://img.xkw.com/dksih/QBM/2022/4/21/2962977032921088/2963740677832704/STEM/0bf9bca0-774e-45da-b586-edbca4bbd26a.png?resizew=160)
(1)设
(弧度),将绿化带总长度
表示为
的函数;
(2)试确定
的值,使得绿化带总长度最大,并求最大值.
![](https://img.xkw.com/dksih/QBM/2022/4/21/2962977032921088/2963740677832704/STEM/0bf9bca0-774e-45da-b586-edbca4bbd26a.png?resizew=160)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ed15020c1c669e06a3a3b1557242e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe3c32177de03f8413f85d4a16ff647f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)试确定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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【推荐1】如图,在扇形
中,
的平分线交扇形弧于点
,点
是扇形弧
上的一点(不包含端点),过
作
的垂线交扇形弧于另一点
,分别过
作
的平行线,交
于点
.
![](https://img.xkw.com/dksih/QBM/2023/7/18/3283487415312384/3284151321051136/STEM/fcb63f883fed4951a36e57c324111810.png?resizew=201)
(1)若
,求
;
(2)求四边形
的面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1eb76f88cb973c220cffa1c9c0721a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4eda47dcb8380c4274cf0ff2c04618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f65dbed884e2248ec075655c684aa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d240ea67c239b0d9213448c11cba18c2.png)
![](https://img.xkw.com/dksih/QBM/2023/7/18/3283487415312384/3284151321051136/STEM/fcb63f883fed4951a36e57c324111810.png?resizew=201)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc790cfaa59a808c25a7edb95dc29fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】设α是锐角,利用单位圆证明下列不等式:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dda6feb152b17350c2d83b67582c033.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783a94fe87b6aa7ca9258d5fbbcc3cbd.png)
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【推荐3】某中学为美化校园将一个半圆形边角地改造为花园.如图所示,
为圆心,半径为
千米,点
、
、
都在半圆弧上,设
,
,其中
.
、
、
三部分组成,求当
取何值时,参观的线路最长;
(2)若在花园内的扇形
和四边形
内种满杜鹃花,求当
取何值时,杜鹃花的种植总面积最大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9cded3be0e3c88a3f00550eacd4f313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/297f91f8de05cd18a6053b675836d59f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f63ceea8e3338aea834d5f8187f80f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c023f4b501684abd869b36d6e6c7f21f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)若在花园内的扇形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7f11db05569a88a3da8d4b635d0ff94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73fcc14ccfc36cf709bf5a4aa32dfa00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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【推荐1】已知
,
(ω>0),函数
的最小正周期为π
(1) 求函数
的单调递减区间及对称中心;
(2) 求函数
在区间
上的最大值与最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61607d26703ed70d79db3f0ef2d6779b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0096672fb974ce3b9e976a0cc39cc215.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e7b2150ed88d3ffdec3d142617eacf.png)
(1) 求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2) 求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a52298e06894173520ca36a565bef5.png)
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【推荐2】已知函数
的最小正周期为
,再从下列两个条件中选择一个作为已知条件:
条件①:
的图象关于点
对称;
条件②:
的图象关于直线
对称.
(1)请写出你选择的条件,并求
的解析式;
(2)在(1)的条件下,当
时,求
的最大值和最小值,并指出相应的
取值.
注;如果选择条件①和条件②分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95791f4c2fe3c7049ef810325977b5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630fb26ede6fb280085f33c8aae6aa01.png)
条件②:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/720091d877ca5e2837b0f410fb99631d.png)
(1)请写出你选择的条件,并求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f2b0b4b894612d63af5e3e452c625c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
注;如果选择条件①和条件②分别解答,按第一个解答计分.
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【推荐1】在锐角三角形
中,已知角
所对的边分别为
,且
.
(1)若
,求角
的大小;
(2)已知向量
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd1f914d3be629136fa854b5d3031cb9.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc941c8c266e0c1f0b20e8810b5b9810.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
(2)已知向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e04b34d81fe69858e3c5491a2a8e9de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a0ed0263849c02282d70fae6a7d5ae9.png)
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【推荐2】已知函数
.
(1)求
的值;
(2)求函数
的最小正周期及单调递增区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1383d8ec748ac5f4e4a4919fa0b56f56.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/025c8847bf8d8f4b2f7d85d1dc32b250.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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【推荐3】设函数
.
(1)求函数
的最小正周期和对称轴方程;
(2)在
中,
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f073427598cc6c311e8a91fbce421f.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ee61e64fece28f3c7b274edbc82bd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/293546f25258503a6953e52cea616287.png)
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