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解题方法
1 . 已知函数
的定义域是
.
(1)求实数a的取值范围;
(2)解关于m的不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a930ba7df8c0035c9d16118b1e96b0c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
(1)求实数a的取值范围;
(2)解关于m的不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8151e46f72ee87b69288d5d1aae6384.png)
您最近一年使用:0次
2022-01-22更新
|
827次组卷
|
6卷引用:甘肃省酒泉市2021-2022学年高一上学期期末数学试题
2 . 对于问题:已知
,求
的值,有同学给出如下解答:
由
,可得
,所以
,
即
,解得
,或
,所以
或
.
由于
或
均满足
,故
的值为1或4.
该同学的解答过程是否正确?若不正确,分析错因,试举例说明,并予以更正(写出正确的解答过程及结果).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd0da7d7a1b242ccd2a068a7e50df80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e7bf9200b351a259ddfc6c0266129d.png)
由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/674df75526279e8c93ae755b13251dcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d72b9272ac27be8f2c3f6fc69f0aafec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01636b7a042154c7457f77d2278383ec.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c0bfb1ac4c9091f08ac7172b007053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42498f6e0fc9a61c9857b70a87f02c5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01d9bcbc75ffbf824b9ec266030df358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b32361241c4906a09dc79db55351bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e87a46fbb3f24cc37638c8c25cc6baae.png)
由于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b32361241c4906a09dc79db55351bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e87a46fbb3f24cc37638c8c25cc6baae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c328c9c4ec69c4275e27576fb61655.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e7bf9200b351a259ddfc6c0266129d.png)
该同学的解答过程是否正确?若不正确,分析错因,试举例说明,并予以更正(写出正确的解答过程及结果).
您最近一年使用:0次