解题方法
1 . 某城市公园有一如图所示的绿化带,其形状由一个直径为
的半圆
和矩形
组成,其中
.管理部门规划在圆心
处建造一个亭子,为了方便游客到亭子游玩,决定从A地出发修建一条经过亭子
处到达
的公路,具体路线是:在半圆
上选点
(异于
,
点),从点
沿圆弧到点
,再从点
经过亭子
的直线到达
边上的点
处.已知从点
到点
的修路费用每千米需要
元,从点
到点
的修路费用每千米需要
元,设
弧度,从
地经点
,
到
地修路所需费用为
元.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/174f2b91-c470-4045-8e59-b291190728e3.png?resizew=144)
(1)试将
表示为
的函数
,并写出定义域;
(2)当
取何值时,修路所需费用最少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26016c9a610be4da74086a37c3327d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61322bc59ed9c2419acf31d42ce4d17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2564bf6e8c421b22dfb26f6837ede1e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09bd4c637c65384d1a8138e42d31641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f5a953038f38cce86187f1619f6876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/174f2b91-c470-4045-8e59-b291190728e3.png?resizew=144)
(1)试将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96eecf3f5484148eddcae82248dc1fa4.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefd06c239145a2b6ae87a955aa51414.png)
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2 . 某阅读平台为了吸引用户,决定对部分图书开展限时免费阅读活动.当提供免费阅读的图书为a本时,其用户人数
(
表示不大于a的最大整数).当
时,用户人数为________ ;若该平台想通过本次活动使用户人数不少于5000,则至少需要提供免费阅读的图书数量为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d1125c62a0a3eb85a060f72f0d5dd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc520cc41fdb61f9e3bd5d7c0baa1b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f9592eabfc91de9786e9f564338eea.png)
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2021-11-19更新
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3卷引用:山东省济南市章丘区2021-2022学年高一上学期期中考试数学试题
3 . 现有一堆物品,从上向下看,第一层有2个物品,第二层比第一层多1个,第三层比第二层多2个,第四层比第三层多4个, 依次类推,若第
层物品个数为
,则
________ ;若数列
满足
, 则数列
的前
和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/414187fca31df508dbf88d7f2bb83662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329adf31fb7432fb64608342bf94f7a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36f8aa467935494ef84a225831cadfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
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4 . 某同学制作一种扇形模型如图,已知扇形的圆心角为120°,DC与OA平行,且
,扇形半径为
,则CD的长为___________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9333586e8927a3de803a0a9fba34e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc77beb651e61df8cdd507abcf301c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://img.xkw.com/dksih/QBM/2021/11/2/2842680728428544/2852001322500096/STEM/3967d6c2c37d438181b1df3333167a43.png?resizew=177)
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20-21高一·全国·课后作业
解题方法
5 . 给出下列条件:①
;②l与
至少有一个公共点;③l与
至多有一个公共点.能确定直线l在平面
外的条件是________ .(填序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff259ba50b735db32427fc0ebfbdfdaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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3卷引用:山东省潍坊市2021-2022学年高二上学期高中学科核心素养测评数学试题
名校
6 . 如图1,在矩形
与菱形
中,
,
,
,
分别是
,
的中点.现沿
将菱形
折起,连接
,
,构成三棱柱
,如图2所示,若
,记平面
平面
,则( )
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844657931567104/2844713479184384/STEM/66b7b4d75a89494d80b15fba956f4073.png?resizew=158)
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844657931567104/2844713479184384/STEM/c3c21240789448b48b396eb70adfd673.png?resizew=158)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0041488020a3e19377b18a70fbf82e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c89f9fb5d1a84be8aee78dca23090d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e5089d811caeed93dc3bcc108d122a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5214ffa82aa775edc14bf625edd54cbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee618381a1176c3f1504cc059eb2010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23205fa9081ee5fe649093380d61640.png)
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844657931567104/2844713479184384/STEM/66b7b4d75a89494d80b15fba956f4073.png?resizew=158)
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844657931567104/2844713479184384/STEM/c3c21240789448b48b396eb70adfd673.png?resizew=158)
A.平面![]() ![]() | B.![]() |
C.直线![]() ![]() | D.四面体![]() ![]() |
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5卷引用:山东省青岛市青岛第五十八中学2021-2022学年高三上学期期中数学试题
山东省青岛市青岛第五十八中学2021-2022学年高三上学期期中数学试题山东省青岛市青岛第十九中学2021-2022学年高三上学期期中数学试题2022年全国著名重点中学领航高考冲刺试卷(一)数学试题(已下线)考点33 直线与平面所成的角【理】-备战2022年高考数学典型试题解读与变式(已下线)热点06 空间位置关系的判断与证明-2022年高考数学【热点·重点·难点】专练(全国通用)
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7 . 如图,已知△ABC与△ADC关于直线AC对称,把△ADC绕点A逆时针旋转
,得到△AFE,若B,C,E,F四点共线,且
,
.
(2)求△ADE的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
(2)求△ADE的面积.
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解题方法
8 . 设
是函数
的导数,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e250e3bb9c60adda2a0b372b0228dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c632915009c584a7e5f55ced7063bc.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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5卷引用:山东省青岛市青岛第五十八中学2021-2022学年高三上学期期中数学试题
山东省青岛市青岛第五十八中学2021-2022学年高三上学期期中数学试题陕西省西安市西北工业大学附属中学2021-2022学年高三上学期10月联考数学理科试题(已下线)第5章 导数及其应用 单元综合检测(难点)(单元培优)-2021-2022学年高二数学课后培优练(苏教版2019选择性必修第一册)安徽省合肥市第一中学2022-2023学年高三上学期学业质量评价作业(二)数学试题广东省深圳市福田区红岭中学2024届高三高考适应性考试数学试卷
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9 . 若实数
满足曲线
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8b39681ba69ba8ecc36fea2d615ef0e.png)
A.![]() |
B.![]() ![]() |
C.直线![]() ![]() |
D.曲线C上有4个点到直线![]() |
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山东省威海市乳山市第一中学2021-2022学年高二上学期10月月考数学试题(已下线)考点18 圆与方程-2022年高考数学一轮复习小题多维练(新高考版)四川省泸州市泸县第四中学2023-2024学年高二上学期期中数学试题
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解题方法
10 . 在①a+c=13,②b=7,③a+b+c=20三个条件中选一个填在下面试题的横线上,并完成试题(如果多选,以选①评分).
已知△ABC的角A,B,C的对边长分别为a,b,c,ccosA-2bcosB+acosC=0.
(1)求角B;
(2)若 ,c>a,
,求sinA.
已知△ABC的角A,B,C的对边长分别为a,b,c,ccosA-2bcosB+acosC=0.
(1)求角B;
(2)若 ,c>a,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02244404efc05421fa49c0aafe5f51a6.png)
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