某蔬菜生产基地的气温较低时,用装有恒温系统的大棚栽培一种新品种蔬菜.如图是试验阶段的某天恒温系统从开启到关闭后,大棚内的温度
(℃)与时间
(
)之间的函数关系,其中线段AB、BC表示恒温系统开启阶段,双曲线的一部分CD表示恒温系统关闭阶段.请根据图中信息解答下列问题:
![](https://img.xkw.com/dksih/QBM/2022/8/13/3043526221357056/3044255089016832/STEM/d6e606c51daa432489bb5a936500813c.png?resizew=284)
(1)求这天的温度
与时间![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
的函数关系式;
(2)求恒温系统设定的恒定温度;
(3)若大棚内的温度低于10
时,蔬菜会受到伤害.问这天内,恒温系统最多可以关闭多少小时,才能使蔬菜避免受到伤害?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933311c0c090e1138e4dd388b7adf8a.png)
![](https://img.xkw.com/dksih/QBM/2022/8/13/3043526221357056/3044255089016832/STEM/d6e606c51daa432489bb5a936500813c.png?resizew=284)
(1)求这天的温度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b6bdf14defa2893d1d46690f710a59.png)
(2)求恒温系统设定的恒定温度;
(3)若大棚内的温度低于10
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7443a616953b0e8677e22822322e4954.png)
更新时间:2022-08-14 11:35:44
|
【知识点】 函数
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【推荐1】如图,在
中,
,点
在
轴上,且
,
点的横坐标是
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经过
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解答题-问答题
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较易
(0.85)
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【推荐2】如图,在平面直角坐标系中,抛物线
经过点
并与x轴交于点A,B两点,且点B坐标为
.
![](https://img.xkw.com/dksih/QBM/2022/8/13/3043585879023616/3044530395086848/STEM/a4e17d0c66f24ac088aa3d18eceaed20.png?resizew=206)
(1)求抛物线的解析式;
(2)若抛物线与y轴交于点C,顶点为点P,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5378fa2ca42394d3cba0fd3fd25b40bc.png)
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(1)求抛物线的解析式;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31039dbbbcad3eaa3c85a3ddfeca2b3e.png)
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