名校
1 . (1)若不等式
成立的充分不必要条件为
,求实数
的取值范围.
(2)已知
是正数,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b644058f6e41f394225aa5be87ccbc39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47f8d234c1df11e957b9bd7d3f2da47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b02d6c35e60d19d2ee791c5584bfc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e64a8e8e9b6c2f1f4e3fd1829b71eec.png)
您最近一年使用:0次
2019-06-28更新
|
336次组卷
|
2卷引用:甘肃省嘉陵关市第一中学2020-2021学年高三下学期六模考试数学(文)试题