题目
题型:填空题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182836-26201.png)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182836-67730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182836-95369.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182836-67730.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182837-51131.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182837-25386.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182837-11795.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182836-67730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182837-84495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182838-50035.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182838-94500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182837-11795.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182836-67730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182838-97508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182838-87786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182839-23971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182836-67730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182838-97508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182839-57918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182839-23971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182837-25386.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182839-23971.png)
综上可得,正确的命题为①②③
核心考点
试题【设函数f(x)= (x∈Z).给出以下三个判断:①f(x)为偶函数;②f(x)为周期函数;③f(x+1)+ f(x)=1.其中正确判断的序号是________(】;主要考察你对指数函数图象及性质等知识点的理解。[详细]
举一反三
如图①,一条宽为l km的两平行河岸有村庄A和供电站C,村庄B与A、C的直线距离都是2km,BC与河岸垂直,垂足为D.现要修建电缆,从供电站C向村庄A、B供电.修建地下电缆、水下电缆的费用分别是2万元/km、4万元/km.
(Ⅰ)已知村庄A与B原来铺设有旧电缆仰,需要改造,旧电缆的改造费用是0.5万元/km.现
决定利用旧电缆修建供电线路,并要求水下电缆长度最短,试求该方案总施工费用的最小值.
(Ⅱ)如图②,点E在线段AD上,且铺设电缆的线路为CE、EA、EB.若∠DCE="θ" (0≤θ≤
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182827-98204.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182828-24977.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182822-12191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182822-67973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182822-13764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182822-12191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182822-43335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182822-68106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182823-94619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182823-81290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182823-95435.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182812-95066.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182812-96756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182812-65979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182811-11251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182811-71952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182811-68024.png)
定义在R上的单调函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182808-65670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182808-92910.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182808-71565.png)
(I)试求
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182809-65913.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182808-65670.png)
(II)若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182809-24062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182809-24543.png)
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