题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133708-79154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133709-32340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133709-64270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133709-31840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133710-68761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133710-13198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133709-31840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133710-59189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133708-79154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133710-94005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133709-64270.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133710-60124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133711-28672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133711-65879.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133711-99433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133711-90519.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133712-90039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133712-29649.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133712-86877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133712-12239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133713-32014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133713-34034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133713-44295.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133713-30282.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133713-72365.png)
且
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133714-15469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133714-90996.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133714-74687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133714-74687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133714-76011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133715-89349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133715-63431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133715-65641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133715-47374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133715-51266.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133716-44795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133716-69715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133715-47374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133708-79154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133716-15537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133716-66636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133717-38476.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133717-18735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133717-25826.png)
只要
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133717-32482.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133718-68859.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133718-44498.png)
知
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133718-88361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133718-68292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133718-35018.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133719-78401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133719-87942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133719-21896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133719-80640.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133712-86877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133720-19957.png)
综上,a的取值范围为
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133720-19957.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133330-78036.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133330-78818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133208-37051.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133050-41143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133050-53376.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133050-39469.png)
(I)求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133050-77842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133050-89046.png)
(II)求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133051-79914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133024-46127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133025-71691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133025-55787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133025-88218.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133025-29615.png)
(Ⅱ)当实数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133025-44442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133026-82945.png)
(Ⅲ)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133026-57502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133007-31395.png)
(Ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133007-64951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133008-43691.png)
(Ⅱ)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133008-64289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133008-86732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133008-75455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018133008-58117.png)
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