设函数
(
且
)
(1)若函数
存在零点,求实数
的最小值;
(2)若函数
有两个零点分别是
,
且对于任意的
时
恒成立,求实数
的取值集合.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a637f57b83fb17f262fc2e97964e8790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe44f86ff6a1e9e56c61dea14ddba8a6.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefd06c239145a2b6ae87a955aa51414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047056c99b39c70fa40d3c8178e5b631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24adb7a7280607088b049827dad8580e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2020-01-14 16:44:09
|
相似题推荐
解答题-问答题
|
较难
(0.4)
解题方法
【推荐1】已知函数
.
(1)当
时,
①若函数
满足
求
的表达式,直接写出
的递增区间;
②若存在实数
使得
成立,求实数
的取值范围;
(2)若函数
满足
当
时,恒有
,试确定a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0693bdda6262161628357314330501.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
①若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d54a84d9f8a6823180479a3fdb6d4788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
②若存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3993391fe16e7315c4d92af28c03fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8a5d53a13ccc4cbbbc811863363793.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d65cc1b39c916ec353c19dd9f4a71c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c58e6839b75d38c53abcfa08273adb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87bee56ee7542354c65007d2ad20fea9.png)
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(0.4)
【推荐2】已知二次函数
.
(1)若
的两个零点的平方和为7,求实数a的值;
(2)若函数
在
上的最大值为1,求实数a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb42643f5273864e7a9349e22224a6a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e2f34ff4dde826ce300469631afc99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed937c70e80009dc02053042d43718b.png)
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较难
(0.4)
解题方法
【推荐3】已知函数
是指数函数,且该函数的图象过点
,设
是定义在
上的奇函数.
(1)求函数
的解析式;
(2)若集合
,求实数
的取值范围;
(3)若对任意的
,不等式
恒成立,求实数
的取值范围.(其中
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e970c7f3475d3fbfa01d06a3b43dd4e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8997621a85b662eec0c993fb4d9be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac66eb793b0bf5ba02c6a9f87cd9ca2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168163183a3d4663be45755f44676191.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff1379a723742c9132b85575d13a19b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5b5a11125264252cd8fb331e620f280.png)
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【推荐1】已知函数
.
(1)若
,讨论
的单调性;
(2)已知存在
,使得
在
上恒成立,若方程
有解,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb128a52a0a93940f221fabfb2a82a3.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)已知存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3908e4a8e8675114473bb3a831181c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3abba38c8677fc7664d819a070e4e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64de2eae60fea94a70dbad2dc7c4df13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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名校
【推荐2】已知函数
,
.
(1)求
的单调区间;
(2)设
,当
时,存在
,
,使方程
成立,求实数m的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a936fda68a5a673adcb1d18db2ed00a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b89e51552149d4f6845d559ff0c4d491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4b788b0775c6f40304045449860e63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e782457ec0edfb09c01da0c26ec6710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e63bbadc6250f7139836ede33205550.png)
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(0.4)
解题方法
【推荐1】函数
(
为自然对数的底数).
(1)若
,求
;
(2)若关于
的方程
有三个不相等的实数解
.求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ceff26a3c71729b5da2edffbd3a8767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b4bf4b8f5797abd8e8a0950ec647604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
(2)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6af5c76ec9d1f28ff48b91adfa279f9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894e50c6e3243ed66ab2d08f3b20ba92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8893a79d3bcd230b7f7eb02a6e0664dc.png)
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名校
解题方法
【推荐2】已知函数
.
(1)若方程
的两根为
与
,求
的值;
(2)设函数
,若
的最小值为1,求实数
的值;
(3)设函数
,记
为
的反函数,设函数
,当
时,
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e7c1e306fe3124dc730b2f8f681bdd.png)
(1)若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/124f5d03ab9692ef07f1ad6913e4b0e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450398974b1561ca801e102e16df6789.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/489c86eac6482ddbc9d704b0debb4c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/028517e8bebe634441e0a5c79828e88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ec52b67f780fa3f0eff0197a20a17b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686a0e76d6c06d4a507e47833eaa5755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02f196f6236188084f3b2c9f2b68c05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a34a33d135646e1b7581ecac91fbcffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9907849f70ca76e2d5cc80b5ced07452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8380ca790c38c3ebae35965834016f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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