已知函数
的图象如图,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/0f7b378c-8899-4be9-90b5-a3dff0ea8886.png?resizew=209)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5db6bb3e79597aefb97f8c9be63f63ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4753f4a4456d0df13843b71015bfa14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/0f7b378c-8899-4be9-90b5-a3dff0ea8886.png?resizew=209)
A.-6 | B.-8 | C.6 | D.8 |
更新时间:2019-11-07 16:01:54
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【推荐2】已知函数
为坐标原点,若对于
图象上的任意一点
,将线段
绕着
点逆时针方向旋转
后,点
落在
的图象上,则实数
( )
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A.![]() | B.![]() | C.![]() | D.2 |
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【推荐3】中国是茶的故乡,也是茶文化的发源地,茶文化是把茶、赏茶、闻茶、饮茶、品茶等习惯与中国的文化内涵相结合而形成的一种文化现象,具有鲜明的中国文化特征.其中沏茶、饮茶对水温也有一定的要求,把物体放在空气中冷却,如果物体原来的温度是
,空气的温度是
,经过t分钟后物体的温度为θ℃,满足公式
.现有一壶水温为92℃的热水用来沏茶,由经验可知茶温为52℃时口感最佳,若空气的温度为12℃,那从沏茶开始,大约需要( )分钟饮用口感最佳.(参考数据;
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)
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解题方法
【推荐1】已知对数函数
的图象经过点
与点
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,
,
,则 ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5e3594a193c89a39eab15016c72809.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/accc2ee7d5bf5db9fa3ea5bb280a696f.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】若函数
的图象与函数
的图象关于直线
对称,且
,则实数
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
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A.![]() | B.1 | C.![]() | D.![]() |
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解题方法
【推荐1】已知函数
满足
,且
时,
,则
与
的图象的交点个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebcf961c4caea57b98607d7b7f5ded42.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318a16f1950d06e5500c76d8f81a507f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b78620c52c1e8b94b828d50863bf3926.png)
A.1 | B.2 | C.3 | D.4 |
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【推荐2】已知函数
,若
的零点个数为4,则实数
取值范围为( )
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【推荐3】设
是定义在
上的偶函数,对
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,且当
时,
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恰有3个不同实根,则
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