已知函数
.
用定义证明:函数
在
上单调递增;
设关于x的方程
的两根为
、
,试问是否存在实数t,使得不等式
对任意的
及任意的
恒成立?若存在,求出t的取值范围;若不存在说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40d57d0fed5c255128b0c2a1d20cf2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0b745d5465633473e07c0055549c6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31f65143002337999112472b704c7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/040135d64192de075ba0cc9f11ddbc9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa33c2bd791339d32821077846605d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d6b4f4ae2f32b2f1beaa2800c60810.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0430c8be9697bef27e0acdae282011b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0614f7542f29a7b8024bd4736d6178ab.png)
更新时间:2018-12-15 23:25:16
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【推荐1】已知定义域为R的函数
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【推荐2】形如
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0532faa17b446c0ca048a4e53f71b0eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da2c4f9a457c237174fda5866d7f9ebc.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86304c3e26200299a0480641525a283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc0218391757871723fa717351f57b6b.png)
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(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c67a31d1beae1dbd11849caafb9366.png)
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【推荐1】设函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0570f5d07a27d8137e9d832c946937.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc64eaf4cd6737b000b28f1fcdd16c4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
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(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882b660047bb6ded500cedba57958e00.png)
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【推荐2】已知函数
,
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bbf195d76cbb11f2aa193e1012ee0eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d53e355ca4830800a94a86b298f76e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f4c78214e43a8b93f2a57072033cbcf.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e1c9c97de9198d47306216e9961b80.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
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(3)若对
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