1 . 已知函数
有三个零点,求
的取值范围______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb8449783d0c6101a3933ccef7543602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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名校
2 . 设
,函数
.
(1)讨论函数
的零点个数;
(2)若函数
恰有两个零点
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e36c4a0587c78c0d17e90b20b422f2.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c07bbaa783c21744c573ce71de07b92a.png)
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3 . 已知函数
有两个零点分别为
和
,则
的取值范围是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05dcda93bb923646e4683bf592fb2813.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
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解题方法
4 . 已知
若存在
使得
,则m的范围是___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bad846a61b2a130673cf6bba340940d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1310a7a80d1f8751a3f8cafe7f8c8b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f6411f48a8ce1651af50fe3ac27fbbc.png)
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5 . 存在实数
使得函数
有唯一零点,则实数
可以取值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/025d0a17feb7e0d5a141300d47b609c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() | C.![]() | D.1 |
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6 . 若函数
,恰有3个零点,则实数a的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f9a68a19e5b14292edc772627a3f352.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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7 . 已知
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e705a22b34fa7212e4ded4c6e67e38a.png)
(1)若方程
有两个不等的实数根
,比较
与1的大小.
(2)若关于
的方程
有且只有一个实根,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64263fe2ca48e694c87496d61e63fb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e705a22b34fa7212e4ded4c6e67e38a.png)
(1)若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bbb93a836a3206907c2953f2f234c78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aca579894dad67bc82cb715fd48e0d70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b6ab702f8e93cc1e680a7d7af06786.png)
(2)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a22f957e6dc093c5f94be3060fec8ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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8 . 函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c2a4fc4b224d81d33e5cde6a7a6fdb.png)
是
上的奇函数,且
.
(1)求函数
解析式,并说明函数的单调性;
(2)若方程
在
上有且只有一个实根,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c2a4fc4b224d81d33e5cde6a7a6fdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc876c76ade5694eef670e15d1b05159.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26adb8926e85d93d87e254077e251d8b.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78bfcba69656a2f800a54ac9298ec1b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e11f4ca0e7ace69f92130d0525bcdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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9 . 已知函数
在
上有且仅有
个零点,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923b4cecc99a7a9290cfcacee40e88d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d01dc2d99655cf7598837cb0886166ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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10 . 已知函数
,若方程
在区间
内恰有两个实数根,则
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a1ec5e064cad5af6dd5f48c1c7c8310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a778d3dfcd0ddd7101d6dc115f18498e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f98636883f883be943a087ba195be27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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