题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082626-69259.png)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082626-55858.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082626-67112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082626-55858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082627-61238.png)
(3)当
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082627-98490.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082626-55858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082627-30946.png)
(4)若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082626-55858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082627-30946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082627-43052.png)
则其中正确的命题是 .
答案
解析
试题分析:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082628-76002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082628-65089.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082628-85374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082626-67112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082629-91215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082629-61179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082627-98490.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082629-44056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082629-25755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082627-30946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082626-69259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082627-30946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082626-55858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082627-30946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082629-44056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082627-30946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082630-36826.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082630-69575.png)
点评:复合函数单调性由构成它的两基本初等函数单调性决定,两基本初等函数单调性相同则复合后递增,单调性相反则复合后递减
核心考点
试题【设函数,给出下列命题:(1)有最小值;(2)当时,的值域为;(3)当时,在区间上有单调性;(4)若在区间上单调递增,则实数a的取值范围是.则其中正确的命题是 】;主要考察你对四种命题等知识点的理解。[详细]
举一反三
A.逆命题为“单调函数不是周期函数” | B.否命题为“周期函数是单调函数” |
C.逆否命题为“单调函数是周期函数” | D.以上三者都不对 |
设直线
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082548-13313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082549-62811.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082549-94832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082549-75244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082550-55275.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082550-55275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082550-64891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082550-22060.png)
(2)写出上述命题的逆命题并证明此逆命题为真;
(3)请你类比椭圆中(1)、(2)的结论,写出双曲线中类似性质的结论(不必证明).
①
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082543-94782.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082544-79268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082544-24261.png)
②若m>0,则方程
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082544-53056.png)
③渐近线方程为y=
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082544-11727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082544-63444.png)
其中真命题的序号是__________________.
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082530-93235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082518-66552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082518-30970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082518-54977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082518-33694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082519-41792.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082519-19161.png)
②若向量
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082519-41792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082519-19161.png)
③若向量
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082519-41792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082519-19161.png)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082519-16557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102082519-11556.png)
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