题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135239-47783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135239-55631.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135239-64703.gif)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135239-52323.gif)
(2)记
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135240-28873.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135240-36994.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135240-37337.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135240-83424.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135240-39616.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135241-73322.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135241-81549.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135239-55631.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135239-64703.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135241-38631.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135241-78639.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135241-63391.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135242-25188.gif)
(2)∵
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135242-86332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135242-67670.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135242-70981.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135243-36617.gif)
1°当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135243-27381.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135243-71175.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135243-54047.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135242-67670.gif)
2°当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135244-12530.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135244-71964.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135244-74606.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135244-56654.gif)
∴函数在
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135242-67670.gif)
3°当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135244-85449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135245-32456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135245-34687.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135244-74606.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135245-77892.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135245-41212.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135244-74606.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135245-72471.gif)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135246-33523.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135246-95916.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135244-85449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135246-24794.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135246-52397.gif)
综上,当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135247-32910.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135242-67670.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135244-85449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135247-52131.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135247-35822.gif)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135224-51432.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135224-40771.gif)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135224-40771.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135224-76012.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135204-34314.gif)
(I)求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135205-92477.gif)
(II)若对于所有的
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135205-87645.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135205-21454.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135147-22500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135148-55777.png)
⑴若
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135148-48907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135148-45491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135148-44638.png)
⑵若在区间
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135149-38555.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135149-14623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135138-95883.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018135138-86014.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
已知x=4是函数f(x)=alnx+x2-12x+11的一个极值点.
(1)求实数a的值;
(2)求函数f(x)的单调区间;
(3)若直线y=b与函数y=f(x)的图象有3个交点,求b的取值范围.
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