题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125808-97348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125808-88675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125808-89656.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125809-85629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125809-79184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125809-40926.png)
(2)若存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125809-99550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125810-33656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125810-37423.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125809-99550.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125809-85629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125810-55142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125810-81524.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125811-58584.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125811-22115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125810-33656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125811-89524.png)
而
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125811-85593.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125812-79162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125812-27096.png)
(2)函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125810-33656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125810-37423.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125812-82176.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125812-62521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125812-78933.png)
① 当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125813-96130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125813-35674.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125813-65775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125813-22347.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125814-94011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125814-31898.png)
再令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125814-45658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125814-41988.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125815-96897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125815-24520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125815-29589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125815-94246.png)
∴ 当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125815-96897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125815-13195.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125816-19246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125816-79875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125815-94246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125816-82379.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125816-50172.png)
② 当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125817-79426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125817-16036.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125813-65775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125817-77596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125817-34568.png)
由①知,当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125817-79426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125818-87560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125815-29589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125818-36180.png)
∴ 当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125817-79426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125815-13195.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125816-19246.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125816-79875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125818-36180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125818-46684.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125818-77085.png)
由①及②得:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125819-21774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125809-99550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125819-25847.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125757-68659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125757-30208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125757-42965.png)
(1)判断函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125757-32453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125757-59540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125757-70084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125758-87500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125758-47690.png)
(2)是否存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125758-45363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125758-32856.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125758-74309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125758-28592.png)
若存在,求出
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125758-85289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125747-17763.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125747-79261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125747-23884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125748-69205.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125748-36976.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125748-25141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125748-73405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125749-39633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125749-68887.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125738-91686.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125739-84931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125739-62602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125739-36225.png)
(2)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125739-96872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125718-27398.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125718-76577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125718-69604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125718-69700.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125719-17303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125701-29450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125701-36160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125702-44359.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125702-16239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125702-18570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125702-81286.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125703-57430.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125702-16239.png)
(3)是否存在等比数列
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125703-26058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125703-37488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125703-54296.png)
(4)若
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125704-83875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125704-23833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125703-54296.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125704-14291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125704-14291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125704-30012.png)
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