题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182355-17984.jpg)
其中,
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182356-48503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182356-93540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182356-48181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182356-55108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182356-68785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182357-82308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182357-71055.png)
(1)记以
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182357-39305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182356-68785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182357-99041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182357-56698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182358-71057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182358-54017.png)
(2)记
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182358-71728.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182358-52754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182358-36863.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182359-82470.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182358-54017.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182359-52919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182358-54017.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182358-71728.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182359-79278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182358-71728.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182359-52104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182359-90025.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182400-95788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182400-71519.png)
(2)由于
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182400-53222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182400-35952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182400-84807.png)
<
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182401-21318.png)
再裂项求和即可证明结论.
解:(1)依题设
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182358-71728.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182359-79278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182401-13577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182359-52104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182401-85217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182400-95788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182400-71519.png)
两边平方整理得:
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182401-72413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182401-98619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182402-93201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182402-20916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182402-92159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182402-41383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182403-66024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182359-52919.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182403-60945.png)
设前几个圆型小道的施工总工时为
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182403-23691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182403-37080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182400-84807.png)
<
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182401-21318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182404-90251.png)
故5周内能完成前
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182358-54017.png)
核心考点
试题【 (本小题满分14分)某城市自西向东和自南向北的两条主干道的东南方位有一块空地市规划部门计划利用它建设一个供市民休闲健身的小型绿化广场,如下图所示是步行小道设计】;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
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182351-42860.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182351-67650.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182351-90823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182352-77187.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182349-68419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182349-18563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182345-29738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182340-94026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182340-24651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182341-23905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182341-61355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182341-16541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182341-35660.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182337-93214.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819182337-60880.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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