解题方法
1 . 如图,网格纸中小正方形的边长为1,粗线画出的是某几何体的三视图,则该几何体的表面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/b02ea565-3f8c-444e-b5e0-a394e91b2480.png?resizew=185)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/b02ea565-3f8c-444e-b5e0-a394e91b2480.png?resizew=185)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2 . 某特色餐馆开通了美团外卖服务,在一周之内的某特色菜外卖份数
(份)与收入
(元)之间有如下的对应数据:
![](https://img.xkw.com/dksih/QBM/2018/7/8/1984220637487104/1985715957899264/STEM/2bc76a3cb9c24403bf9c5edc91e42746.png?resizew=649)
(1)画出散点图;
![](https://img.xkw.com/dksih/QBM/2018/7/8/1984220637487104/1985715957899264/STEM/d50483f6ca464de99c8d269d1922acab.png?resizew=273)
(2)求回归直线方程;
(3)据此估计外卖份数为12份时,收入为多少元.
注:参考公式:线性回归方程系数公式
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40ea92b18e6a33485441818d471945f.png)
参考数据:
,
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/2018/7/8/1984220637487104/1985715957899264/STEM/2bc76a3cb9c24403bf9c5edc91e42746.png?resizew=649)
(1)画出散点图;
![](https://img.xkw.com/dksih/QBM/2018/7/8/1984220637487104/1985715957899264/STEM/d50483f6ca464de99c8d269d1922acab.png?resizew=273)
(2)求回归直线方程;
(3)据此估计外卖份数为12份时,收入为多少元.
注:参考公式:线性回归方程系数公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9705b34ce41bc38410806aae00089099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40ea92b18e6a33485441818d471945f.png)
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff8994704df1c297dee1ebaec19c57c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a83b2e51d7a12d3c3b63eb05a631e7fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc5ea4f4e91392870dc8fc7b63c033a.png)
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