已知函数
与
存在公切线,则实数a的最小值( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c817c0db45a27b8026fd82ed14d9e1d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f422d25cce8b6b1275f1387f0e2c4c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2020-12-26 20:45:27
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【知识点】 两条切线平行、垂直、重合(公切线)问题
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【推荐1】若函数
与
的图象存在公切线,则实数a的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6373c8c79328162061319acefbd93ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8be7dc10a713aa9e8b3df4187b66fab.png)
A.![]() | B.![]() | C.![]() | D.1 |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐2】过平面内一点
作曲线
两条互相垂直的切线
,切点为
(
不重合),设直线
分别与y轴交于点
,则下列结论正确的个数是( )
①
两点的横坐标之积为定值;
②直线
的斜率为定值;
③线段
的长度为定值;
④
面积的取值范围为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d426da126764af5f027b98d570475d98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5425108c557f0f21474c045334f97d9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5425108c557f0f21474c045334f97d9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a949c00526fddf435423272cf10f25.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a949c00526fddf435423272cf10f25.png)
③线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf87d9d48c3de0a5e9f1a70e51a0bef.png)
A.1 | B.2 | C.3 | D.4 |
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