名校
1 . 已知函数
,
,定义函数
.
(1)设函数
,
,求函数
的值域;
(2)设函数
,
,当
时,恒有
,求实常数t的取值范围;
(3)设函数
,
,k为正常数,若关于x的方程
(b为实常数)恰有三个不同的解,求k的取值范围及这三个解的和(用k表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f786a5701dc1a8a015e8843c3360151b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca9b18ab846f3c0e9f2d43411b14206.png)
(1)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66af78df39959ad44d45a78180b4406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f4d924f38e53fb0346c93d24d873a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f5a90aeba435af22d6bcdb7b91650b8.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adfe1836fa9a55cc7d7a8b3d0a978336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2babf138586dd7b8c246074a321cee17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00879cffccc124857ca755a8c345e45f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd9cadcbc109026959badc27568edf6.png)
(3)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595f3e50fa0d95d0ea4e3f7bcbcf1086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecca8bacf273f34ac4b7ddedd4cc04cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f24749ede53ce3c383db6d4f3e7365.png)
您最近一年使用:0次
解题方法
2 . 已知函数
在
上单调递减.
(1)求实数
的取值范围;
(2)当实数
取最大值时,方程
恰有二解,求实数
的取值范围;
(3)若
,求证:
.(注:
为自然对数的底数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b8744c94d54246ce023e8a88b998c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d303edb2b74f0152e9da9e0b77a1ca37.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f826c4322fdbf0838670d917f7735e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f86f9b0f357d6166ebc79012bf88706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55278cd8cbc74b25a26141e20fe78e16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9003a22f3bfbdc2dba7869c0f7d54c8c.png)
您最近一年使用:0次
3 . 已知常数
,定义在
上的函数
.
(1)当
时,求函数
的最大值,并求出取得最大值时所有x的值;
(2)当
时,设集合
,
,若
,求实数m的取值范围;
(3)已知常数
,
,且函数
在
)内恰有2021个零点,求常数a及n的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b2843f3b1a991fa7f3f17a2dba790bb.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b624d88827e92e12bc0a8f1067cbe72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22a4a0dd7307a1323d25331e60782d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60fa306feeeb158bf3b1aa5944fc2011.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19dc63588f1c96bee2fe56ae5ec3e5bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9d50619b779c1056602f46b2a95e90.png)
(3)已知常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4613271f782a90ab580131d09d03d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e167b43045b3297248e334c41c621b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0b396c8cd1754fb25acce89a06d280.png)
您最近一年使用:0次
解题方法
4 . 已知向量
,
,函数
.
(1)求函数
的解析式和单调递增区间;
(2)若
,
,
分别为
三个内角
,
,
的对边,
,
,
,试判断这个三角形解的个数,并说明理由;
(3)若
时,关于
的方程
恰有三个不同的实根
,
,
,求实数
的取值范围及
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb5110a7b35b951896e11db7e0960fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3231559f61823495ff825e612dbdb935.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2104745f6548c40d42d046514e78df46.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a0d5cf8c22d0cf93274939d92963665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e10cf0c037dc56bdd6814bd49bea77ca.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6e637aa8edb845a102f8b3c0f9fd8f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8648913f926215240fe65777db61ac46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35bacde908aec2c313978fc4309d82bc.png)
您最近一年使用:0次