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解题方法
1 . 设
.
(1)证明:
;
(2)若
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca542e78b7d77d008c9c4752afa91a55.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b38f4d0d6c0bcfe2a58984ffd439813.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a79651ddbf4aa8c53d5173ab9177b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2021-05-08更新
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954次组卷
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6卷引用:宁夏银川市2021届高三考前适应性训练(一)数学(理)试题