题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033211-99367.gif)
(1)是否存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033211-53861.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033211-14802.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033211-20589.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033211-53861.gif)
(2)若以
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033211-53861.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033211-53861.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033212-32777.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033212-88030.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033212-67818.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033212-36736.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033211-53861.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033213-13297.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033213-43364.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033213-41586.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033211-53861.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033213-77504.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033213-13297.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033213-11070.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033213-43364.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033214-54758.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033214-11692.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033214-35192.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033214-90297.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033213-41586.gif)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033213-43364.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033214-54758.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033215-62544.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033213-43364.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033211-53861.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033215-51673.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033215-64528.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033215-45225.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033212-32777.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033212-88030.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033212-32777.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033215-76095.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033216-25853.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033212-67818.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033212-36736.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033211-53861.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033216-42631.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033216-13132.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033216-35524.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033213-11070.gif)
而
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033217-70713.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033217-20216.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033211-53861.gif)
④ 当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033217-37280.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033217-42229.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033217-28517.gif)
⑤当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033218-36648.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033213-11070.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033218-86090.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033218-33320.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033218-47237.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033218-18868.gif)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033219-21350.gif)
故只需
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033219-15056.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033219-45604.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033218-36648.gif)
综上所述,
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033211-53861.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033213-77504.gif)
核心考点
试题【已知集合.(1)是否存在实数,使得集合中所有整数的元素和为28?若存在,求出符合条件的,若不存在,请说明理由。(2)若以为首项,为公比的等比数列前项和记为,对于】;主要考察你对等差数列等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033207-24497.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033207-31120.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033207-11149.gif)
则公差
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033158-46641.gif)
已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033149-33871.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033149-88941.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033150-55891.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033150-23556.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033150-74413.gif)
(1)求k的值;
(2)求证
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033150-84211.gif)
(3)记
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033151-85390.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033151-75790.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033151-13594.gif)
某环保小组发现衡水市生活垃圾年增长率为b,2010年衡水市生产垃圾量为a吨,由此可以预测2020年垃圾量为( )
A.![]() | B.![]() | C.![]() | D.![]() |
在数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033120-11587.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033120-87208.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033120-44058.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013033120-66466.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
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