已知函数
.
(1)当
时,求
的单调区间;
(2)当
时,若不等式
恒成立,求实数
的取值范围;
(3)若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb61f71e825f97ab9f6bab5ecc7be431.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44a5f921d2b2e2fc41a52a0535089666.png)
更新时间:2021-08-24 23:13:33
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解题方法
【推荐1】已知函数
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(2)若
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(1)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4c9bbaac684afb03f8270398d41ac32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7926703c19e89a7438753101df731738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1cfb60420ff7e72c1b9d64f69ae063.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/109c14e7a0c4dce57fd2b86eba638692.png)
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名校
解题方法
【推荐1】已知函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8936c6b949d6cefaa46d7a607e3c4ac1.png)
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