解题方法
1 . 已知集合
,不等式
的解集为
.
(1)当
,求实数
的取值范围;
(2)已知函数
,且
,求此函数的最小值构成的函数
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0fd15292e05ad8cb8c0876fbdd59fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf84e4d9f4a7edc2643fda82bc5e6ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea9a4259cca10c1f5af28e621ebafd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494876393be320dd15648efc75967d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2ac429737efebf150a1bd088ba846.png)
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名校
2 . 下列命题中为真命题的是( )
A.不等式![]() ![]() |
B.若函数![]() ![]() ![]() ![]() |
C.函数![]() ![]() |
D.若![]() ![]() ![]() ![]() |
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3 . 下列说法中正确的是( )
A.已知函数![]() ![]() ![]() ![]() |
B.函数![]() ![]() |
C.设函数![]() ![]() ![]() ![]() |
D.已知函数![]() ![]() ![]() ![]() ![]() |
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解题方法
4 . 已知函数
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ca4e1ff987f48d167d1a7e6344f3b6f.png)
A.![]() ![]() |
B.![]() ![]() |
C.不等式![]() ![]() |
D.若![]() ![]() ![]() ![]() |
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解题方法
5 . 函数
的图像如图所示,定义域为
,其中
,
,当
时.图像是二次函数的一部分,其中顶点
,当
时,图像是指数函数的一部分.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/6648dea6-3531-4e14-9329-39f005d1cf7e.png?resizew=179)
(1)求函数
的解析式:
(2)求不等式
的解集:
(3)若
对于
,恒有
恒成立.求出
的取值范围(不要求计算过程).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe86cace140f2c3588ab115837bbfc9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d381f8891b6b2d2417b7df2492eb3b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302e421a250119f34d8f3c9928730490.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bad324be3bebd9c8051c5f502df2b536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d381f8891b6b2d2417b7df2492eb3b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f5d54ea50d01535318b10a9fa570931.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/6648dea6-3531-4e14-9329-39f005d1cf7e.png?resizew=179)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbc3dfb24fa1f2a3bbfdb74f5f91eaf.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681d6d27b23b1c41834d7516122f73f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aebfb85aae9dd1ada8c9bc10008f987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae828be829213bd6b66651dce99263c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
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解题方法
6 . 已知函数
.
(1)若不等式
有解,求
的取值范围;
(2)若不等式
的解集为
,且
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e9a50198a83113fd0f68a99a6a1a34.png)
(1)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a71baf6217604517fd98fa97d0f55b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186c166f14581082203b070b36cabb52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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7 . 已知函数
,
.
(1)当
时,
,则不等式
的解集;
(2)若存在
使关于
的方程
有四个不同的实根,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72bc09352dfb8a9a9df6d97a7a49beb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a1a5f2533b8ea54b7022383f875666.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22a4a0dd7307a1323d25331e60782d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c96b9db81642de841e145f9fec26f710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c90d5ba8d25cf822886cd9357bf032.png)
(2)若存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c93d770f34594693cba4e160fc4687d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
8 . 已知函数
.
(1)求不等式
的解集
;
(2)对
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe819909452c1edb8e1f0e3f1adc562.png)
(1)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66d61d5f66d68b4c4a2a25fd7103621.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5431dcf880a7c4a82c2ba4db99320d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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9 . 二次函数
满足
,再从条件①和条件②两个条件中选择一个作为已知,完成下面问题.
条件①:
;
条件②:不等式
的解集为
.
(1)求函数
的解析式;
(2)在区间
上,函数
有零点,试确定实数m的取值范围;
(3)设当
(
)时,函数
的最小值为
,求函数
的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51eb2613dda00677d447c986cac505bc.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c292ad5ab432ba87d945d952ae84d2b8.png)
条件②:不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880a4c98bc8d627a784542d4e3e7e261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/881fe2df23c5a0fe1d1fecbe9ffa55fb.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)在区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0f9f734c03d04c21edefa08e0acc1fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84ffd6a2c10103ca7f4b47a697abe98e.png)
(3)设当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a9564a20c1081d01e2c1febb103046b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf039c46a25e331446c6ee1e9af3c82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a82a1224e47f31ecdfffd328d5a3ab6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a82a1224e47f31ecdfffd328d5a3ab6d.png)
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解题方法
10 . 给出下列结论,其中正确的结论是( )
A.函数![]() ![]() |
B.已知函数![]() ![]() ![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.关于![]() ![]() ![]() ![]() ![]() ![]() |
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