已知函数
的定义域为D,若对于
,
,
,
分别为某个三角形的边长,则称
为“三角形函数”.给出下列四个函数:
①
;②
;③
;④
.其中为“三角形函数”的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1a90a3f1cc4c59144645dfdaed6daf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f484115a9df1b6060d6b14df85c6f38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35770a47ffcba6bf1d94eceabb416d96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee0882f5f575d9e0ae7677efbd41b38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f77de30ac6928b56422fa3fd3553f5e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e030ad3f42f1f3beffaa11c69630b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133d2db6c4c3ed2c2b7783dc80a5c8c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62ef59cb4d79fd5396113c50bece657.png)
A.①②③ | B.②④ | C.①③ | D.①③④ |
更新时间:2022-04-01 10:34:40
|
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解题方法
【推荐1】函数
,当
时,函数的值域为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d1abf5d0de9b63d0f95466b89e1ed0d.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】
,记
,则函数
(
)的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73254f32b6da29ecc32df2e9f87a4c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/808ba80e821964a689ba1a2dbafb9fda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/774938ff9c7fa8978cb8d6765009d71b.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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适中
(0.65)
【推荐1】已知映射
,其中
,对应法则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f39040d48dcf0d018067b7e6a9bfeb4f.png)
.若对实数
,
在集合
中存在元素与之对应,则
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c18c5a035fd258bb6e372ae16496850.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3be879e2b7453bba2e64acc828583d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f39040d48dcf0d018067b7e6a9bfeb4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0726d25ca1f413723623fea11b9e4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b72803d750e1954d1c5fe0a00ffd2bb.png)
在集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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【推荐2】已知函数
,若对任意的
,都存在唯一的
,满足
,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5234dba7379eb0fc2501377bf083166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b424bbc2f301c0ce92ed914fd49fa98c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/728697bd9af445ae7525af9168fdf816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859458471c86ae39e0cc42d2d960d03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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解题方法
【推荐2】已知函数
的定义域为
,则函数
的定义域为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5d6c53369152ea110a8613bd3b7f747.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d9e01546cc72497f83d9a4add6e482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd8d62ad777d3500e9b528c50273b94.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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【推荐1】函数
的图像大致为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c18767b4717334de9fa5d34da9d15ba.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
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【推荐2】已知函数
,在下列结论中:
①
是
的一个周期;
②
的图象关于直线
对称;
③
在区间
上无最大值
正确结论的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/855ca7ec3aac51f7648b62837ec3c123.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e2d7c958e99bcd9d7f251c19ee3544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c63e1c64c42b7f3b7fdc396d4756cab.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b2b756a6909d8bc5692711d5626ba3f.png)
正确结论的个数为( )
A.0 | B.1 | C.2 | D.3 |
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