名校
1 . 已知抛物线
的焦点为F,过F的直线l与C相交于A,B两点,
,
是C的两条切线,A,B是切点.当
轴时,
.
(1)求抛物线C的方程;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ea1be9b9b6bb12afa7e1ce703d1603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ecbb94ac8dfe5fbc3bffad8c9da301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f371c0b1d573c06516ab1904d95ee49f.png)
(1)求抛物线C的方程;
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4efe5fedcd0679981be05353d6f5a90b.png)
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2 . 已知函数
.
(1)当
时,求函数
的单调区间;
(2)若对于任意的
,都存在
,使得
成立,试求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eaa76627f6f3f7623a78abc70e77d4d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a01cf2049366b2f0172302495f44c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17641d15644d5fb2c79fd1016b21520f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c91115b5fbe700381cc43c19f1d28771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
3 . 对于问题“求证方程
只有一个解”,可采用如下方法进行证明“将方程
化为
,设
,因为
在
上单调递减,且
,所以原方程只有一个解
”.类比上述解题思路,则不等式
的解集是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c18c032d75893db45e61e6c4eb0d4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c18c032d75893db45e61e6c4eb0d4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cfb1e9557770560280b5248ae2d0d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856491b01dab707170d83a1bc4b1f257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/933093b52cca887f597cbe22a5467b11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec65a2bec3d4296c613a80b3ae41d5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2197c1c9e5e09713fe45dc1e73edf509.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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4 . 已知函数
.(
)在
处的切线l方程为
.
(1)求a,b,并证明函数
的图象总在切线l的上方(除切点外);
(2)若方程
有两个实数根
,
.且
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8c371ea6fc9eece5d0b3b974812ea7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068ff25c767fcbe6fe596d996031eed1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea2d1082b4d7a98b91ef55c41b84551.png)
(1)求a,b,并证明函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(2)若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c0d827ef8598ba6b70b34b2bdcd1e9.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/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df108ae1d7fb8a7f769820a4c3ecf89f.png)
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5 . 已知函数
.
(1)讨论
的单调性.
(2)当
时,证明:
对
恒成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57be0295836f67840bab7473bab3b32b.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836ecf91a3de07ccc3a01a1f179653d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66692ec49a458f9e48c7315d03dfc37b.png)
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名校
6 . 已知函数
.
(1)求函数
的图象在
处的切线方程;
(2)判断函数
在
上的极值点的个数,并说明理由.
(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba203c4c148c7948ec1faaa64f92e101.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
(2)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a7792efd7f82bfa7549db4cb6ca761.png)
(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32691a557f9ab048e36bc8da07901310.png)
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名校
7 . 已知函数
的图象与函数
的图象关于某一条直线l对称,若P,Q分别为它们图象上的两个动点,则这两点之间距离的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8e74a0914727f4a02e6580493893fd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d2b2dd5b97f1c4dbe89de4043d21e2.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
8 . 已知函数
.
(1)求函数
的图象在
处的切线方程;
(2)证明:函数
在区间
内存在唯一的极大值点
.(参考数据:
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba203c4c148c7948ec1faaa64f92e101.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
(2)证明:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bfab3c57a062f346b06d869e5bc7ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d73bcda1a31b7a8760ab3dd1363be07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d93f072d5da2f0f2b590e353469ee83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32691a557f9ab048e36bc8da07901310.png)
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9 . 已知函数
.
(1)当
时,求
的零点个数.
(2)若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2cd745a8f803eb9d35c4a6f1d156a8d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/743fa3ddf2396a2a7f3075533dbb40e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0567498233cd665f177fca60da7e349.png)
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2022高三·全国·专题练习
10 . 已知函数
.
(1)求曲线
在点
处的切线方程;
(2)求证:函数
存在单调递减区间
,
,并求出单调递减区间的长度
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7d3d298ee69a90af6d40ae27b12dee.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eefffa1689b5a68786b9a5875f12c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22840186db0afc0e2b2e8915ce79b998.png)
(2)求证:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f944dbcd1a2a1cc595573f63b244e9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4cfd131ea8772fea719318c865c907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/371cbba672a1a8a4412aa0bc4100f5cd.png)
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