名校
1 . 有
张卡片分别写有数字
,从中任取
张,可排出不同的四位数个数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55391379f350f5b342003590f018d99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2018-07-19更新
|
5619次组卷
|
7卷引用:西藏拉萨片八校2018-2019学年高二下学期期末联考数学(理科)试题
2 . 从1,3,5,7,9中任取3个数字,从2,4,6,8中任取两个数字,一共可以组成没有重复数字的五位偶数的个数为
A.2880 | B.7200 | C.1440 | D.60 |
您最近一年使用:0次
2016-12-04更新
|
2136次组卷
|
2卷引用:2015-2016学年西藏林芝市高二下学期期末数学(理)试卷
3 . 某种产品的广告费支出
与销售额
(单位:万元)之间有如下对应数据:
![](https://img.xkw.com/dksih/QBM/2016/8/8/1572971142242304/1572971148492800/STEM/069c565306b84b22a11ff5485e9a61dd.png)
(1)求广告费支出
与销售额
回归直线方程
(
,
);
已知
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99442c12de1b02d1898ec4c14f3664f2.png)
(2)在已有的五组数据中任意抽取两组,求至少有一组数据其预测值与实际值之差的绝对值不超过
的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/2016/8/8/1572971142242304/1572971148492800/STEM/069c565306b84b22a11ff5485e9a61dd.png)
(1)求广告费支出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b033de5aee71e2ad6a00691adde820b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bd1b5c820f64b9c3033d2a34ee6a925.png)
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f179013b89da8fb8d52990fbc0f0568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99442c12de1b02d1898ec4c14f3664f2.png)
(2)在已有的五组数据中任意抽取两组,求至少有一组数据其预测值与实际值之差的绝对值不超过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
您最近一年使用:0次