1 . 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 |
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2 . 下列函数中,在区间(0,1]上是增函数且最大值为-1的为( )
A.y=-x2 | B.![]() |
C.![]() | D.y=2x |
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2018-01-09更新
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345次组卷
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2卷引用:四川省凉山宁南中学2021-2022学年高二上学期开学考试数学(文)试题