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)
21-22高二下·湖北·期中 查看更多[4]
湖北省鄂东南省级示范高中教育教学改革联盟学校2021-2022学年高二下学期期中数学试题(已下线)第01讲 任意角和弧度制及三角函数的概念 (高频考点—精练)湖北省黄冈市浠水县第一中学2022-2023学年高二下学期期中数学试题广东省佛山市顺德区第一中学2022-2023学年高二下学期期中数学试题
更新时间:2022-04-22 17:28:45
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适中
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解题方法
【推荐1】已知函数
.
(1)当
时,求
的单调区间;
(2)若
在定义域内单调递增,求
的取值范围.
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(1)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】已知常数a>0,函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd44686808daaddb673ccb3d3e7bb18.png)
(1)求f(x)的单调递增区间;
(2)若0<a≤2,求f(x)在区间[1,2]上的最小值g(a);
(3)是否存在常数t,使对于任意
时,f(x)f(2t﹣x)+f2(t)≥[f(x)+f(2t﹣x)]f(t)恒成立,若存在,求出t的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd44686808daaddb673ccb3d3e7bb18.png)
(1)求f(x)的单调递增区间;
(2)若0<a≤2,求f(x)在区间[1,2]上的最小值g(a);
(3)是否存在常数t,使对于任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea07fb6fe31e57166893f2739d85b35b.png)
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【推荐3】设函数f(x)=ax3+bx2+c,其中a+b=0,a,b,c均为常数,曲线y=f(x)在(1,f(1))处的切线方程为x+y﹣1=0.
(Ⅰ)求a,b,c的值;
(Ⅱ)求函数f(x)的单调区间.
(Ⅰ)求a,b,c的值;
(Ⅱ)求函数f(x)的单调区间.
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【推荐1】设函数
.
(1)当
时,试求
的单调增区间;
(2)试求
在
上的最大值;
(3)当
时,求证:对于
恒成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f2c679e263eda5038ecfc8f5d132d6.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
(2)试求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8ed0edaebe95e5347b44806e166d0e1.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aedfe3447b63ae2f093ee7435fbeae22.png)
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【推荐2】已知函数
,且曲线
在点
处的切线与直线
平行.
(1)求实数
的值,并判断函数
的单调性
(2)记
,若
在
上单调递减,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71bbc565946552c1c7ac3bbaaf04025e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50866229ec5a3640fb250f9bd2192b3.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)记
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
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【推荐1】在意大利,有一座满是“斗笠”的灰白小镇阿尔贝罗贝洛(Alberobello),这些圆锥形屋顶的奇特小屋名叫Trullo,于1996年被收入世界文化遗产名录(图1).现测量一个屋顶,得到圆锥SO的底面直径AB长为12m,母线SA长为18m(图2),C,D是母线SA的两个三等分点(点D靠近点A),E是母线SB的中点.如从点A到点C绕屋顶侧面一周安装灯光带,求灯光带的最小长度.
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958752880410624/2961699711049728/STEM/1f7c44eb-89c9-4fa2-aa9f-9df5f23cedc9.png?resizew=356)
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【推荐2】如图,设扇形的圆心角
,半径为
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(2)用
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(2)用
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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名校
解题方法
【推荐1】如图所示:一吊灯的下圆环直径为4米,圆心为O,通过细绳悬挂在天花板上,圆环呈水平状态,并且与天花板的距离(即
)为2米,在圆环上设置三个等分点
,点C为
上一点(不包含端点O、B),同时点C与点
均用细绳相连接,且细绳
的长度相等.设细绳的总长(即
)为y米.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/c43daf82-5a04-470f-bbed-78d827fad8ea.png?resizew=130)
(1)设
,将y表示成
的函数关系式,并指出
的范围;
(2)请你设计
,当角
正弦值的大小是多少时,细绳总长y最小,并指明此时
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(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f055080e2c68dcf0aada8d96938c3b60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)请你设计
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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【推荐2】如图所示的是某地区一“月牙湖”的示意图,该湖的湖岸线由一段半圆弧(弧
),抛物线的一部分(曲线
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与
)组成,其中
为半圆弧的圆心,且为抛物线的顶点.已知
,
,在半圆弧
上选取一点
,在曲线
上选取一点
,使得
,现欲在
与
两点间建一座桥,且桥长为
.
![](https://img.xkw.com/dksih/QBM/2021/11/26/2859578566828032/2865472683745280/STEM/8f420767-185a-41ef-9896-c3410f062b63.png?resizew=248)
(1)设
,
,试写出
关于
的函数表达式;
(2)假设桥的修建费按桥面每平方米
元来计算,桥宽为
,且桥面为矩形,当桥长
达到最大值时,试问修建费共需多少万元?并求此时
的值(单位:
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564743a1fe463a981f06914e3cb5e03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c84c1e5a8fac655a06374d15813fd5e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edfaf064eebdb1ef119dca3eb73bd744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564743a1fe463a981f06914e3cb5e03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3bbc948e3db266a4d0f1b1c8474355.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d44e8bc37ed03f44470762748a8f942a.png)
![](https://img.xkw.com/dksih/QBM/2021/11/26/2859578566828032/2865472683745280/STEM/8f420767-185a-41ef-9896-c3410f062b63.png?resizew=248)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91659c48df1d3099346bb34fd277ff54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9921dbdd7b942132aae2fb8e1082a25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)假设桥的修建费按桥面每平方米
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98ac61206cb12cf6686bb0facf635010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36b51b654efcff60d2d640b9b4c4471.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/766a81bd0afbfc4a6aeff49f91d7f193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfe2e03840cb2f0c7a89cb2b6153c7d9.png)
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