2022高三·全国·专题练习
1 . 中国茶文化博大精深,茶水的口感与茶叶类型和水的温度有关为了建立茶水温度
随时间
变化的函数模型,小明每隔
分钟测量一次茶水温度,得到若干组数据
、
、
、
,绘制了如图所示的散点图.小明选择了如下
个函数模型来拟合茶水温度
随时间
的变化情况,函数模型一:
;函数模型二:
,下列说法不正确的是( )
![](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/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56720e2f2b0ddd72156da495923698da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2852ae85cfcc804b3192ea8543c88938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92abae836b8026511113ad8c3ea23028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](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/d509acc69bf59b24c5d63aefbcfb9a03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ee85730cc6b42d0c083a348b5bbffa.png)
A.变量![]() ![]() |
B.由于水温开始降得快,后面降得慢,最后趋于平缓,故模型二能更好的拟合茶水温度随时间的变化情况 |
C.若选择函数模型二,利用最小二乘法求得到![]() ![]() |
D.当![]() ![]() ![]() ![]() |
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