下面左图是我省某地斜拉式大桥的图片,合肥一中学数学兴趣小组对大桥有关数据进行了测量,并将其简化为右图所示.其中桥塔AB,CD与桥面AC垂直,若
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/281bb833-5575-41a2-93ad-df4345c1b6ca.png?resizew=247)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/f4e9f0ee-bdc6-4f8f-bf84-19d2a33ab0f4.png?resizew=188)
(1)当
时,试确定点P在线段AC上的位置,并写出求解过程;
(2)要使得
达到最大,试问点P在线段AC上何处?请写出求解过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4faefeec865f2ab8fe012946f6d25eff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/281bb833-5575-41a2-93ad-df4345c1b6ca.png?resizew=247)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/f4e9f0ee-bdc6-4f8f-bf84-19d2a33ab0f4.png?resizew=188)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19543ea2e76e3b620a18fc22c682af12.png)
(2)要使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbf1667b21a273bf5dd007d65eeda7c.png)
更新时间:2020-03-29 20:43:17
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【推荐1】如图所示,某市拟在长为8 km的道路OP的一侧修建一条运动赛道,赛道的前一部分为曲线段OSM,该曲线段为函数y=Asin ωx(A>0,ω>0,x∈[0,4])的图象,且图象的最高点为S(3,2
);赛道的后一部分为折线段MNP.求A,ω的值和M,P两点间的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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【推荐2】如图,某园林绿化单位准备在一直角ABC内的空地上植造一块“绿地三角形ABD”,规划在三角形ABD的内接正方形BEFG内种花,其余地方种草,若
,
,种草的面积为
,种花的面积为
,比值
称为“规划和谐度”.
(1)试用
表示
,
;
(2)若
为定值,BC >AB,当
为何值时,“规划和谐度”有最小值?最小值是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2efb46714efa6a13a121e2a7f89412.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ad5a9147b25285124851a61c7d1a24a.png)
(1)试用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665cfec8ab4d3e3f7d972a52c73fa254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://img.xkw.com/dksih/QBM/2011/12/30/1570669577011200/1570669582393344/STEM/12dcd6ff-47ff-4428-929d-9d94a0a2c4a5.png?resizew=101)
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解题方法
【推荐1】设函数
,
为
的导函数,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/014a3c4361d37150f53daed3e01adcdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f972a7a1d05b45cffb5a291f0863c7e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5a60a03674de7688ba4ef4028e59c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2abd03ee4c3b75953bbe45ee875e4aac.png)
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【推荐2】如图,在平面直角坐标系
中,以
轴为始边作角
和
,
,
,其终边分别交单位圆于
、
两点.若
、
两点的横坐标分别是
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/558b4b18-4a4d-4617-9d7e-c4adf9ca62ec.png?resizew=194)
(1)求
,
的值;
(2)求扇形
(与劣弧
对应的扇形)的面积
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e5af20b2f8c1fba4470f9650989e51.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/3dcbe8b4bcd32e5a64ebfd873f8cbb2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9be2e0a0816bc26d430622d24909ef97.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14ac165b68ea371bc926f7477ce740d1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/558b4b18-4a4d-4617-9d7e-c4adf9ca62ec.png?resizew=194)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f35152720e43c6403d43bef47c0377d.png)
(2)求扇形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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解题方法
【推荐1】已知二次函数
的对称轴为
,
.
(1)求函数
的最小值及取得最小值时
的值;
(2)试确定
的取值范围,使
至少有一个实根;
(3)若
,存在实数
,对任意
,使
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cb08dcbe16059bfc924ae48d3f80cfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01d2605beb4dfa4e61f9ccf995a3e21d.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)试确定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f6cd0fcfd7db0409d237dc20e1862f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a9f6568ef1fb08cb144137e3493eaa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2425497f56c3bdc9a8d7cde18e41d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09a94fff382fd75609a7f518d8746902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解题方法
【推荐2】已知函数
.
(1)求不等式
的解集;
(2)若函数
的最小值为
,正数
,
满足
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ffc77a665e9cb7aabc960cf97e4261e.png)
(1)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db85e4c6def62c80bbe24cf4ccd84b2e.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab04de6651256f6281e9f4c1dc3c7955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfde095e760c84e51c2793f0d3f34fef.png)
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【推荐3】在2020年初,新冠肺炎疫情袭击全国,广州市某村施行“封村”行动.为了更好地服务于村民,村卫生室需建造一间地面面积为30平方米且墙高为3米的长方体供给监测站供给监测站的背面靠墙,无需建造费用,因此甲工程队给出的报价为:正面新建墙体的报价为每平方米600元,左右两面新建墙体报价为每平方米360元,屋顶和地面以及其他报价共计21600元,设屋子的左右两侧墙的长度均为x米
.
(1)当左右两面墙的长度为多少时,甲工程队报价最低,最低报价为多少?
(2)现有乙工程队也参与此监测站建造竞标,其给出的整体报价为
元
,若无论左右两面墙的长度为多少米,乙工程队都能竞标成功,试求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba3ec4273006745aed606cb2db7df30f.png)
(1)当左右两面墙的长度为多少时,甲工程队报价最低,最低报价为多少?
(2)现有乙工程队也参与此监测站建造竞标,其给出的整体报价为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d35506b232bdcef372c0ee8237798fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf8197e4f3fd18815045d29c357a863.png)
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