解题方法
1 . 给定函数
和常数
,若
恒成立,则称(
)为函数
的一个“好数对”,已知函数
的定义域为
.
(1)若(1,1)是函数
的一个“好数对”,且
,求
,
;
(2)若(2,0)是函数
的一个“好数对”,且当
时,
,判断方程
在区间[1,8]上根的个数;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca25b1357f2968f60f6cee00dddd8b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb49dbba01c4ff5f686ffc8828351b2.png)
(1)若(1,1)是函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc0af419f4bc6f089e3304a477589d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/221a1053479ad1c2eab31e4a40484582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588af5c2d8b6b1140fc56e6f3279d2d4.png)
(2)若(2,0)是函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc0e849b72357de1cdf719a7ed5f1bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3f1ced1f305ed69acc9d54e1c8476.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4262096a01b228bd7e1f77c997691eb.png)
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2 . 定义在
上的函数
满足
,且当
时,
,则函数
在
上的零点个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fad4b961de8e754422378405d843cb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50af11c345056215054f7cfe679939da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fae0961f73fe66ddbb6a2d4c84fd5d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ec5b92ac3fedf5d163d752f68ad65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20aa36cae34afaa391a4319c9c5eb87a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 已知函数
.
(1)求函数
在区间
上的最小值;
(2)若存在不相等的实数
同时满足
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/672ad1412211d11e8be433bb71862f47.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/948dc417ac53671b95ae825dcd815274.png)
(2)若存在不相等的实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e71a5052b0b9676f53e5f8e162ff9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2019-11-30更新
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7卷引用:安徽省合肥市一六八中学2019-2020学年高一下学期入学考试数学试题
4 . 已知函数
,若函数
有两个零点,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fd218ef70319a03556d23cdc584aa8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44bf0c3d872a06269da11cbbcd0176a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
5 . 已知函数
.
(1)若f(-1)=f(1),求a,并直接写出函数
的单调增区间;
(2)当a≥
时,是否存在实数x,使得
=一
?若存在,试确定这样的实数x的个数;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce222059d0e998e77a0606b8047052a.png)
(1)若f(-1)=f(1),求a,并直接写出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当a≥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d28c41c0dab365316497fd39e0426966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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6 . 设函数
满足
,
,且当
时,
,又函数
,则函数
零点的个数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/803b2de32177f5ebb64b38115356f388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b47144278d622b666fcff69aee5abc5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048f8d3ee5bf62cefacbd0ee25839932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1376168658dbe7f5b7f4d75fb1db545a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7192d87d0fa400d5d7dba57924bbbe3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba52ae1bc00300f7426db6e24a81554c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f50750782cfc3d4fbe990473027516f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 已知函数f(x)=
.若f(x)所有零点之和为1,则实数a的取值范围______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65ff76f2b2f2f5bd2c4e436a4f596ee3.png)
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8 . 已知函数
,若函数
与函数
的零点相同,则
的取值范围为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e5c8cd9a48c16ad6622de90360c568a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add1a06062f9196e8e83452269db2316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f2416d1f75a45a314331146550832e.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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9 . 已知函数
.
Ⅰ
设
,
,证明:
;
Ⅱ
当
时,函数
有零点,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b00e359fdf8e317bd6cbdc406e85abf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05fb13c82ef51865e2b602f1e46851df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1352d70b13ae8a9420d93d305009a798.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caadc258f6226ee800bde726a2bcfb5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aba6b840b3747ca29bdeb4ffd96d826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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10 . 已知函数
满足
,当
时,
,那么函数
的零点共有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c25fb0c3e1b6ef211233170b9aa9001.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1591d4244dcf5539a4ae98f554e91e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318a16f1950d06e5500c76d8f81a507f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2187de8d0030ac7e16c1fe3a2b3ccf5a.png)
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