已知锐角
的内角
所对的边分别
,角
.
(1)若
是
的平分线,交
于
,且
,求
的最小值;
(2)若
的外接圆的圆心是
,半径是1,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9890165d935a5a09a722a7aa3a97a7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5f31951fed46f2d7b55f592097f6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6599d90dd30f6240b447b8cda912f768.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc26ade81a66d3157503274b6f9be900.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c3428940cbab11fd2acbe8d377e8a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fcd57936f10d66c294f34478caf063e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbf6fc949da9b05836c4863cff58465.png)
更新时间:2021-05-08 11:30:16
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解答题-问答题
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【推荐1】已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaea2dbd6d99c8edfb4b2076b7dea385.png)
(1)求函数
的最小正周期;
(2)当
时,求
的值域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaea2dbd6d99c8edfb4b2076b7dea385.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc0e19e82588bfb7f50abe325df391a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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【推荐2】已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abed23f48d5ba60328ef919fa649f757.png)
(1)若
,
为锐角,求
;
(2)当
时,方程
有两个不相等的实数根,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abed23f48d5ba60328ef919fa649f757.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdada426931c679afb3089d2f229ef14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f90c4754e6b6fc862d72943fb35569.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce485410257c9c1fae9d87ce3e44cc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb2e46f49adba6036e2624639a1b966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐1】如图,某小区准备将闲置的一直角三角形地块开发成公共绿地,图中
,
,
.设计时要求绿地部分(如图中阴影部分所示)有公共绿地走道
,且两边是两个关于走道
对称的三角形(
和
).现考虑绿地最大化原则,要求点
与点
,
均不重合,
落在边
上且不与端点
,
重合.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/241bbd3b-af4f-4c68-a6d3-84219a4a6ac9.png?resizew=211)
(1)设
,若
,求此时公共绿地的面积;
(2)为方便小区居民的行走,设计时要求
,
的长度最短,求此时绿地公共走道
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e60ae4577cbc7f96e065f0557bc0d0df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc6b94f23607ff4261c371ec9425c8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae963ba456d7bb2a83fd7082582bbf26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7f58eeb3fb122d2b8ebe6b2b44acdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/241bbd3b-af4f-4c68-a6d3-84219a4a6ac9.png?resizew=211)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e31cf7ea7942bbc0fe4680878e5dd2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc1f08c7640e62e8717abf4d44a6c83.png)
(2)为方便小区居民的行走,设计时要求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebad23f7992ba222ddc115f1458065f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐2】如图,已知直线
,
,
之间的距离为
,点
,
分别在直线
,
上,且直线
与
,
夹角为
,点
为线段
的中点,
为直线
上(
右侧)的一个动点,作
,使得
与直线
交于点
,设
.
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983648403816448/2986522860494848/STEM/11609eac-1e40-45f1-af1b-6aa31af18a59.png?resizew=291)
(1)当
时,求
的面积;
(2)写出
面积关于
的函数解析式
,并求面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/027830fc47290062692964077ee481e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c499d3ef329f85e59fd72dec6f453bbc.png)
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983648403816448/2986522860494848/STEM/11609eac-1e40-45f1-af1b-6aa31af18a59.png?resizew=291)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1ba6b6ee00c4b2763cb3fa59caa69f.png)
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【推荐1】如图带有坐标系的单位圆O中,设
,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6276ff5468f5aa9c6eaff479c26cc7.png)
(2)若
,
,
,
,求
的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08517b94b81cf2edff3d09d7073412fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bce3fc8fa60045af4c75e596d956e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23aaac864fc78d73e2248327433e3d7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6276ff5468f5aa9c6eaff479c26cc7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d394016b9fecac73f38cbc4ff18dee2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f07029c97c324d32f258f18a96654a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d590efabf20f5e49b138aceb068a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1615dd4f2f844053c39f552fe03e8621.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eacde1c42151734fdc60f3001b590de.png)
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【推荐2】已知
,
,
与
的夹角
为
. 求:
(1)
;
(2)
;
(3)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1624f865aa8d83b1696f8d59344c47a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/407538138dd68ab917925c2063cc98e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231b861d6d1f1d0b9f52b041cb40eb62.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c39d1d88189726ae99c309644fca3494.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3b981dd9670ec4534a10f39c69c177f.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e362a7b97e93a8dda92759423062809b.png)
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【推荐1】已知函数
.
(1)当
时,解不等式
;
(2)当
时,不等式
成立,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a806310c1f3d624c6363ff48655ab3.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6096dcd8029361d0734ce9382291d02b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f1bcf110c36fea39bd22e435e8c6a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b468c7365e15c301b2013518f5ab103.png)
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【推荐2】要设计一张矩形广告,矩形广告牌的高与宽分别为a,b.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/4989f2e5-124f-47af-89cc-0d5725520cd7.png?resizew=268)
(1)若该广告栏目含有大小相等的上下和左右四栏,且四周空白的宽度为4,栏与栏之间的中缝空白宽度为2,如图1所示.当四栏面积之和为400时,怎样确定矩形广告牌的高a与宽b的尺寸,才能使得整个矩形广告牌面积最小.
(2)若该广告栏目含有大小相等的左、右两栏,且四周空白的宽度为8,栏与栏之间的中缝空白宽度为2,如图2所示.当广告牌面积为1568时,如何设计左、右两栏的高与宽,才能使得广告栏目的面积最大?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/4989f2e5-124f-47af-89cc-0d5725520cd7.png?resizew=268)
(1)若该广告栏目含有大小相等的上下和左右四栏,且四周空白的宽度为4,栏与栏之间的中缝空白宽度为2,如图1所示.当四栏面积之和为400时,怎样确定矩形广告牌的高a与宽b的尺寸,才能使得整个矩形广告牌面积最小.
(2)若该广告栏目含有大小相等的左、右两栏,且四周空白的宽度为8,栏与栏之间的中缝空白宽度为2,如图2所示.当广告牌面积为1568时,如何设计左、右两栏的高与宽,才能使得广告栏目的面积最大?
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