已知
,若关于
的方程
有实根,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394f21a51116358e092cd164e9fc6e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2019-11-13 10:44:50
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相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】已知
.
(1)若
在区间
上单调递减,求实数a的取值范围;
(2)设函数
在
上有两个零点,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137a4ff063b025a5ed986030b6b29653.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c1756b564bf1d998d8179637011c88.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c902c930e43092311891a1b3e9c9d6ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/141f2ad9e03ece6b97f6b1d490c2e3e4.png)
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解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,一块直角梯形区域ABCD,
,
,在D处有一个可以转动的探照灯,其照射角
始终为45°,设
,
,探照灯照射在该梯形ABCD内部区域的面积为S.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/786dbeaf-9966-46bc-9454-721f1189f26b.png?resizew=191)
(1)求S关于
的函数关系式;
(2)求S的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d262480ffb55b7617f44b63f130c154a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c962fe4f47732b8e6e83d17ff2b9af13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72f61e7e7ec70ec02f4be69bd3295d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d4e4a30f64d8ffccb3fb538ed91b4b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/786dbeaf-9966-46bc-9454-721f1189f26b.png?resizew=191)
(1)求S关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)求S的取值范围.
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解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知函数
.
(1)求不等式
的解集;
(2)若不等式
的解集为
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6be9c6348221066c2e49f7629d732113.png)
(1)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2fa77abab331368af0888ffd60e3e4c.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/245e05457440baa9f7c1f42341af918f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】已知函数
,
.
(1)若
,且
恒成立,求实数
的最大值;
(2)若
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be01f5cb16c638ab48e5180c684d5ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c594c9f9440581ead24c06197b948e12.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90f55a25b6e17c6d7fd4915ccb9570e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77aa45826a63e59e1b6db756d31e6247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8a1bd6666ae0b2775eca2339fca75f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2775ffdf695af2d263f0ea93ac5904.png)
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