解题方法
1 . 某公园为了美化环境和方便顾客,计划建造一座圆弧形拱桥,已知该桥的剖面如图所示,共包括一段圆弧形桥面ACB和两段长度相等的直线型桥面AD、BE,拱桥ACB所在圆的半径为3米,圆心O在DE上,且AD和BE所在直线与圆O分别在连结点A和B处相切.根据空间限制及桥面坡度的限制,桥面跨度DE的长要不大于18米,不小于12米.已知直线型桥面的修建费用是每米0.6万元,弧形桥面的修建费用是每米2.5万元,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/fcbe57a7-c0af-45b8-91a8-8e9440d54eb9.png?resizew=204)
(1)若桥面(线段AD,BE和弧ACB)的修建总费用为W万元,求W关于
的函数表达式,并写出
的取值范围;
(2)当
为何值时,桥面修建总费用W最低?(角
的取值精确到
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc464e9a543e2995cd64ad444f0bf340.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/fcbe57a7-c0af-45b8-91a8-8e9440d54eb9.png?resizew=204)
(1)若桥面(线段AD,BE和弧ACB)的修建总费用为W万元,求W关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea6771d7581e9bfff5f7fa9d43f221d.png)
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名校
2 . 已知
,
,
.
(1)记函数
,求函数
取最大值时
的取值范围;
(2)求证:
与
不平行;
(3)设
的三边
、
、
满足
,且边
所对应的角为
,关于
的方程
有且仅有一个实根,求实数
的范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3cbfc36c535fd54311d7e7be39a82be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd351d64a36474ff8f3f1eb64ac5d519.png)
(1)记函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c25f1d401fe5fd8748bb7c89751493b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7a1df960feef63dec4790d63f52279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e82a12f606ee2ee9ee7eff1f805852ac.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988b7e964e313579ab8869d67d5be007.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d28b3145d1fd20a4ab20d9a90fb9c511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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2021-07-19更新
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449次组卷
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4卷引用:上海市川沙中学2022-2023学年高二上学期开学考试数学试题
上海市川沙中学2022-2023学年高二上学期开学考试数学试题上海市建平中学2020-2021学年高一下学期期末数学试题上海市川沙中学2021-2022学年高一下学期期末数学试题(已下线)上海市高一下学期期末真题必刷04-期末考点大串讲(沪教版2020必修二)
名校
3 . 如图所示,将一块直角三角形板
置于平面直角坐标系中,已知
,点
是三角板内一点,现因三角板中,阴影部分受到损坏,要把损坏部分锯掉,可用经过点
的任一直线
将三角板锯成
,设直线
的斜率为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/237dbe42-dbf8-45de-81f3-ee5111c59370.png?resizew=161)
(1)用
表示出直线
的方程,并求出点
的坐标;
(2)求出
的取值范围及其所对应的倾斜角
的范围;
(3)求
面积的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc83f34b5a3c1dc09d990ce4bdc8e078.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f0ebb89b7d83c0a4d1104e0107530d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d708033611e0a04426fac680caf4c17d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a9fc2dda89829fa2c610a8fce86d22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/237dbe42-dbf8-45de-81f3-ee5111c59370.png?resizew=161)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
(2)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a9fc2dda89829fa2c610a8fce86d22.png)
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13-14高二下·浙江杭州·阶段练习
解题方法
4 . 设二次函数
在区间
上的最大值为12,且关于x的不等式
的解集为区间![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffa032400031fc5150223aa32e48c0c.png)
(1)求函数
的解析式;
(2)若对于任意的
,不等式
恒成立,求实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a8d7032a512f70f4cf4e1712ed8ba8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b870f90b3e6cdac664e2743c71e7e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffa032400031fc5150223aa32e48c0c.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdb6c83f4a71273295c17ad36e2395fe.png)
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