1 . 判断下列对应是不是从集合A到集合B的函数.
(1)
,
,对应法则f:对集合A中的元素取绝对值与B中元素对应;
(2)
,
,对应法则
,
,
;
(3)
,
,对应法则
,
,
;
(4)
三角形
,
,对应法则f:对A中元素求面积与B中元素对应.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35cfcbd43b12d0bf55cf3cd9c1e934e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c34d87fab3d4081a167a4e50aa13d52.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f3af991d30789a72aabb9575c3a28e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06db5e8e53b2cc7b2e42114531bf0ef2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5f80c222f7988abf48de4b6efbcd23f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84ae23cf6a2823451f9676220b32c782.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f3af991d30789a72aabb9575c3a28e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e18306ebf275f54eb946ddb7c38397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5f80c222f7988abf48de4b6efbcd23f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84ae23cf6a2823451f9676220b32c782.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee937369dec515fc39d7b6c2f1d4d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef605a7dce0a48fdec3728be12b882dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a84fd2a24aaf702c8303274ebeb5fcf.png)
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2023-08-31更新
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5卷引用:第五章 函数的概念、性质及应用(6大易错与5大拓展)(1)-单元速记·巧练(沪教版2020必修第一册)
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