若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac2484ae9aa41609a2be742d02e48d4.png)
(1)若a=1,求
的最小值;
(2)若
的最大值为
,求a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac2484ae9aa41609a2be742d02e48d4.png)
(1)若a=1,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
更新时间:2017-10-13 23:10:35
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【知识点】 求含sinx(型)的二次式的最值
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【推荐1】定义行列式运算
,若
.
(1)求
的值;
(2)求函数
的值域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3070b64312b35c087afe70f52820e7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01775252ae778641e706709f3e4361bc.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a24a8f5e8fb89381f8add6549170345.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/426462b7ae53b50630e8ce387576f2e5.png)
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解题方法
【推荐2】某公园为了吸引更多的游客,准备进一步美化环境.如图,准备在道路
的一侧进行绿化,线段
长为
百米,
都设计在以
为直径的半圆上.设
.
![](https://img.xkw.com/dksih/QBM/2022/5/10/2976629658025984/2979290289840128/STEM/f09f7b71-6092-4268-b355-f22fcf344e0f.png?resizew=172)
(1)现要在四边形
内种满郁金香,若
,则当
满足什么条件时,郁金香种植面积最大;
(2)为了方便游客散步,现要铺设一条栈道,栈道由线段
和
组成,若
,则当
为何值时,栈道的总长
最长,并求
的最大值(单位:百米).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/813b1b0327154103afd7a728f00cfeda.png)
![](https://img.xkw.com/dksih/QBM/2022/5/10/2976629658025984/2979290289840128/STEM/f09f7b71-6092-4268-b355-f22fcf344e0f.png?resizew=172)
(1)现要在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32456174ceb4a84a74394c32641a6c63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)为了方便游客散步,现要铺设一条栈道,栈道由线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e426224c3a3ce9bb5a731eed81c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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【推荐3】已知函数
的最大值为
.
(1)求
的值;
(2)当
时,求函数
的最小值以及取得最小值时
的集合.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f61e195de74ee1443b73410bff3e8d83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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