函数
在
上的部分图象如图所示,则
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874e49921b5e8318309bac506ccfa325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/161b43cc30647a002dfbc2bb19612589.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/563d9adb-be16-4266-9f8c-e2fd4e2c34ae.png?resizew=146)
2018·江苏南通·一模 查看更多[2]
更新时间:2018-06-05 15:52:23
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【知识点】 由图象确定正(余)弦型函数解析式解读
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【推荐1】海水受日月的引力,在一定的时候发生的涨落现象叫潮.港口的水深会随潮的变化而变化.某港口水的深度
(单位:米)是时刻
(
,单位:小时)的函数,记作
.下面是该港口某日水深的数据:
经长期观察,曲线
可近似地看成函数
(
,
)的图象,根据以上数据,函数
的近似表达式为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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0 | 3 | 6 | 9 | 12 | 15 | 18 | 21 | 24 | |
8.0 | 11.0 | 7.9 | 5.0 | 8.0 | 11.0 | 8.0 | 5.0 | 8.0 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb9b65c51e37f40211b876be02105701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0cfac4324cfb42516915a481a681e2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13378be06b6b01bcad1d261ff14e87cf.png)
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解题方法
【推荐2】已知函数
(ω>0,
),
,点
,
是
图象上的任意两点,若
时,
的最小值为
,则
图象的对称轴是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f430cb2bc31c667cb3e669480bc84fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93778ac16acb542c259b9c4c49b410b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c35ba81cb34c14039ae31cd06840806d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d97517502c30a6c91fb5b2202dc1c230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38e8dabe9d450189263c29b395ffad37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfae7941652c9328d0f95bf49991ca4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800db37ca5e7b0179a1939fd40171504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
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