名校
1 . 已知函数
,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)求证:函数
在点
处的切线恒过定点,并求出定点的坐标;
(2)若
在区间
上恒成立,求
的取值范围;
(3)当
时,求证:在区间
上,满足
恒成立的函数
有无穷多个.(记
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58bfecd54416e2e0366376999e752915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a2216be8742c0fcd67c8185a255aa7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a7c6915d8302ea5c84ed1d5e14ef42e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)求证:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e131b589e93d16f2ed5688fd4fe814d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86209a88158e6e388b59b9a909da3f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a7a4a037a4dfe973f1eb683d93d799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51947e18ac12b186aa3c09e62c036af9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab5e0524def52baf53480b8726784ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc40a37a51ff1dbff3bf0ff2e0adf7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1e6e951882ea171c1dd357c30d32ce.png)
您最近一年使用:0次
2010高三·江苏南通·专题练习
名校
2 . 定义在
上的函数
,如果满足:对任意
,存在常数
,都有
成立,则称函数
是
上的有界函数,其中
称为函数的上界.已知函数
.
(1)当
时,求函数
在
上的值域,并判断函数
在
上是否为有界函数,请说明理由;
(2)若函数
在
上是以3为上界的有界函数,求实数
的取值范围;
(3)若
,函数
在
上的上界是
,求
的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02cab1add26335b3cb43d5b54c7c853.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2480f87a11c4cd450bc9454ea7276722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a1c02c533c60949a994212c90fbeda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bdb8df6cec5c53d441b0666138e6045.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c6ffa6fe2387ee19234c2ad0fcb92ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c6ffa6fe2387ee19234c2ad0fcb92ea.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bdfed8d6862125dc1fecfce0322a750.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e11f4ca0e7ace69f92130d0525bcdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c2750338701e0b246a4bb69afd43fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c2750338701e0b246a4bb69afd43fa.png)
您最近一年使用:0次
2019-08-02更新
|
1488次组卷
|
7卷引用:江苏南通市通州区2010高三查漏补缺专项练习数学理
(已下线)江苏南通市通州区2010高三查漏补缺专项练习数学理(已下线)2010年上海市吴淞中学高三上学期期中考试数学卷(已下线)2012届河南省郑州盛同学校高三上学期第一次月考文科数学(已下线)2014-2015学年湖南省邵阳县石齐学校高一上学期第一次月考数学试卷内蒙古赤峰市2018-2019学年高一下学期期末数学(理)试题安徽省池州市青阳县第一中学2019-2020学年高一上学期期中数学试题四川省眉山市仁寿一中南校区2019-2020学年高一上学期期中数学试题
名校
3 . 设
是定义在
上的增函数,
,且满足:①任意
,
;②任意
,有
.
(1)求
的值;
(2)求
的表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fcec7af3520884b173b29bda6c657a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a227a694dc404d1184578c7d278fd8d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba056dc2ab77f65931d85b673060f735.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a72e549f0c05e65a880149db55efa39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a54da56300aa0ca6d860e7dab876e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d7b83621df77b8aff15c3661e9ad43.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58bb04544fd20027204021a06b256a1b.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fcec7af3520884b173b29bda6c657a.png)
您最近一年使用:0次
2017-06-29更新
|
676次组卷
|
2卷引用:江苏省苏州市第五中学2017届高三12月月考数学试题
2011高三·河北·专题练习
4 . 某工厂拟建一座平面图(如右图所示)为矩形且面积为200平方米的三级污水处理池,由于地形限制,长、宽都不能超过16米,如果池外周壁建造单价为每米400元,中间两条隔墙建造单价为每米248元,池底建造单价为每平方米80元(池壁厚度忽略不计,且池无盖).
![](https://img.xkw.com/dksih/QBM/2011/5/26/1570223850807296/1570223856091136/STEM/902c700a8508468aa4e1b18aca9791d1.png)
(1)写出总造价y(元)与污水处理池长x(米)的函数关系式,并指出其定义域;
(2)求污水处理池的长和宽各为多少时,污水处理池的总造价最低?并求最低总造价.
![](https://img.xkw.com/dksih/QBM/2011/5/26/1570223850807296/1570223856091136/STEM/902c700a8508468aa4e1b18aca9791d1.png)
(1)写出总造价y(元)与污水处理池长x(米)的函数关系式,并指出其定义域;
(2)求污水处理池的长和宽各为多少时,污水处理池的总造价最低?并求最低总造价.
您最近一年使用:0次
2019-01-30更新
|
713次组卷
|
7卷引用:第五章 导数及其应用(压轴题专练)-2023-2024学年高二数学单元速记·巧练(苏教版2019选择性必修第一册)
(已下线)第五章 导数及其应用(压轴题专练)-2023-2024学年高二数学单元速记·巧练(苏教版2019选择性必修第一册)(已下线)新课标高三数学函数与方程函数模型及其应用专项训练(河北)人教版2017-2018学年数学选修1-1阶段质量检测(导数及其应用)数学试题河北省唐山市滦南县2018-2019学年高二上学期期末质量检测理科数学试题河北省唐山市滦南县2018-2019学年高二上学期期末质量检测文科数学试题(已下线)重难点11 等价转化、分类讨论、数形结合等思想解决函数综合问题-2021年高考数学【热点·重点·难点】专练(上海专用)重庆市巫溪县尖山中学2022-2023学年高二下学期第一次月考数学试题
名校
5 . 已知数列
,
都是单调递增数列,若将这两个数列的项按由小到大的顺序排成一列(相同的项视为一项),则得到一个新数列
.
(1)设数列
、
分别为等差、等比数列,若
,
,
,求
;
(2)设
的首项为1,各项为正整数,
,若新数列
是等差数列,求数列
的前
项和
;
(3)设
(
是不小于2的正整数),
,是否存在等差数列
,使得对任意的
,在
与
之间数列
的项数总是
?若存在,请给出一个满足题意的等差数列
;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c88a7ef007c78a93e33bd77c4396626.png)
(1)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebaf2a2590bb84d646957f913d78f6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c336a008a94ec59b3cd0c54b269f1f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95137d12beae203b95add1e669f4a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/608f4ee9444b673f82263ef7f7b2fb73.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b933d363f5b85a6b4110c9ef030c56a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c88a7ef007c78a93e33bd77c4396626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c88a7ef007c78a93e33bd77c4396626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7c0300f2fb87d0945997dd1aa1881a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ea9e0ead7a42e1bcbe7d37d1a60954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e95931effbd59c43e8ed1ea09962b84f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
您最近一年使用:0次
2017-05-14更新
|
966次组卷
|
7卷引用:江苏省盐城市2017届高三第三次模拟考试数学(理)试题
6 . 某湿地公园内有一条河,现打算建一座桥将河两岸的路连接起来,剖面设计图纸如下:
![](https://img.xkw.com/dksih/QBM/2017/3/19/1647033146163200/1647946590740480/STEM/30f0c34163754a4a9e5609184b23ac76.png?resizew=489)
其中,点
为
轴上关于原点对称的两点,曲线段
是桥的主体,
为桥顶,且曲线段
在图纸上的图形对应函数的解析式为
,曲线段
均为开口向上的抛物线段,且
分别为两抛物线的顶点,设计时要求:保持两曲线在各衔接处(
)的切线的斜率相等.
(1)求曲线段
在图纸上对应函数的解析式,并写出定义域;
(2)车辆从
经
倒
爬坡,定义车辆上桥过程中某点
所需要的爬坡能力为:
(该点
与桥顶间的水平距离)
(设计图纸上该点处的切线的斜率),其中
的单位:米.若该景区可提供三种类型的观光车:①游客踏乘;②蓄电池动力;③内燃机动力.它们的爬坡能力分别为
米,
米,
米,又已知图纸上一个单位长度表示实际长度
米,试问三种类型的观光车是否都可以顺利过桥?
![](https://img.xkw.com/dksih/QBM/2017/3/19/1647033146163200/1647946590740480/STEM/30f0c34163754a4a9e5609184b23ac76.png?resizew=489)
其中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/974bc22aed322f940bdd8a83de869edf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e04a5b59cced25ab7057d03fe3c0ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e04a5b59cced25ab7057d03fe3c0ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fed19e09b52266a544aebf9077a1270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a1008494918681c42448ebef61dea6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/974bc22aed322f940bdd8a83de869edf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc96ce462f6a456c6993588e8edb0af2.png)
(1)求曲线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
(2)车辆从
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b237a5e4df47a0a2cf6c468d39085bce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1452ad51bc851e39fb45acb2825089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b418f716e6ea876faa7b003b8af56044.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/742145c3bfb5281e2e583e6405a3d4ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67f08d5e69543f99644ac3c8974c5b58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
您最近一年使用:0次
2017-03-20更新
|
723次组卷
|
5卷引用:2017届江苏省如东高级中学高三2月摸底考试数学试卷
名校
7 . 已知数列
的前
项和为
,且
(
)求数列
的通项公式;
(
)若数列
满足
,求数列
的通项公式;
(
)在(
)的条件下,设
,问是否存在实数
使得数列
是单调递增数列?若存在,求出
的取值范围;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/330046e64d8b57b7b4e111c1518cd18b.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a57ea296b39fb59670bea9034831ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8463e324a3c9e15814de5c3ca425fbb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1de911b700f789379ae46e2cb2067cb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2017-03-20更新
|
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2017届江苏省如东高级中学高三2月摸底考试数学试卷江苏省徐州市丰县中学2020-2021学年高二上学期9月第一次调研测试数学试题辽宁省实验中学东戴河分校2019-2020学年高二上学期10月月考数学试题上海市洋泾中学2018—2019学年高三下学期3月月考数学试题上海市十校2016-2017学年高三下学期3月联考数学试题2017届上海市十二校高三下学期3月联考数学试题(已下线)必刷卷09-2020年高考数学必刷试卷(新高考)【学科网名师堂】-《2020年新高考政策解读与配套资源》(已下线)卷09-2020年高考数学冲刺逆袭必备卷(山东、海南专用)【学科网名师堂】重庆市第八中学校2023-2024学年高二下学期入学适应性训练数学试题(已下线)专题06 数列在高考中的考法(难点,十一大题型+过关检测专训)-2023-2024学年高二数学《重难点题型·高分突破》(人教A版2019选择性必修第二册)辽宁省沈阳市第一二〇中学2023-2024学年高二下学期第二次质量监测数学试题陕西省汉中市西乡县第一中学2023-2024学年高二下学期期中考试数学试题
10-11高三·浙江宁波·期末
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8 .
已知(a>b>0)的离心率e=
, 过点A(0,-b)和B(a,0)的直线与原点的距离为
(I)求椭圆的方程;
(Ⅱ)设F1,F2为椭圆的左、右焦点,过F2作直线交椭圆于P,Q两点,求△PQF1的内切圆半径r的最大值
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9卷引用:江苏省淮安市涟水中学2020-2021学年高二上学期期中数学试题
江苏省淮安市涟水中学2020-2021学年高二上学期期中数学试题(已下线)2011届浙江省宁波市八校高三联考考试数学理卷(已下线)2011—2012学年度黑龙江大庆实验中学高二上学期期末考试文科数学试卷2015届重庆市第一中学高三上学期期中考试文科数学试卷2017届广东省仲元中学高三9月月考数学(文)试卷【全国省级联考】2018年河南省六市高三第二次联考(4月)--数学(文)试题(已下线)专题9.5 椭 圆-2021年高考数学(理)一轮复习-题型全归纳与高效训练突破(已下线)专题9.3 椭圆(精练)-2021年高考数学(理)一轮复习学与练江西省上高二中2022-2023学年高二上学期期中数学小练卷试题(2)
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解题方法
9 . 对于两个定义域均为D的函数f(x),g(x),若存在最小正实数M,使得对于任意x∈D,都有|f(x)-g(x)|≤M,则称M为函数f(x),g(x)的“差距”,并记作||f(x),g(x)||.
(1)求f(x)=sinx(x∈R),g(x)=cosx(x∈R)的差距;
(2)设f(x)=
(x∈[1,
]),g(x)=mlnx (x∈[1,
]).(e≈2.718)
①若m=2,且||f(x),g(x)||=1,求满足条件的最大正整数a;
②若a=2,且||f(x),g(x)||=2,求实数m的取值范围.
(1)求f(x)=sinx(x∈R),g(x)=cosx(x∈R)的差距;
(2)设f(x)=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f457e696b1504bfb73140699a8e18dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e9f52368ac9997d081da50df417df65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e9f52368ac9997d081da50df417df65.png)
①若m=2,且||f(x),g(x)||=1,求满足条件的最大正整数a;
②若a=2,且||f(x),g(x)||=2,求实数m的取值范围.
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10 . 如图,有一块平行四边形绿地
,经测量
百米,
百米,
,拟过线段
上一点
设计一条直路
(点
在四边形
的边上,不计路的宽度),
将绿地分成两部分,且右边面积是左边面积的3倍,设
百米,
百米.
![](https://img.xkw.com/dksih/QBM/2016/12/12/1579118396211200/1579118396776448/STEM/d7428b57e80145d2aa1fe7a2e895ad91.png)
(1)当点
与点
重合时,试确定点
的位置;
(2)试求
的值,使路
的长度
最短.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff235a4cf9fdd26ecfaac57f200c9738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c209ba61e39c0c2575eb3cc6ec235aec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f5b71c93c132c3f5889e832a074978.png)
![](https://img.xkw.com/dksih/QBM/2016/12/12/1579118396211200/1579118396776448/STEM/d7428b57e80145d2aa1fe7a2e895ad91.png)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)试求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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