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1 . 下列说法中,错误的是( )
A.两个复数不能比较大小 |
B.在复数集内,![]() ![]() |
C.![]() ![]() |
D.若![]() ![]() |
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2023-04-19更新
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837次组卷
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5卷引用:江西省清江中学2022-2023学年高一下学期6月期末数学试题
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2 . 下列说法正确的是___________
①方程
(
,其中
为复数集)无解;
②若
彼此相互独立,则
;
③已知点
,
,且
为原点,则向量
在向量
上的投影的数量为
;
④通过最小二乘法以模型
去拟合一组数据时,可知
过点
;
⑤通过最小二乘法以模型
去拟合一组数据时,为了求出回归方程,设
,将其变换后得到线性方程
,则
的值分别是
和0.3.
①方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8646eaa05bfde39d27813c301a076420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3eb5935678e432e6f1f3180bfdb3175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0538986ba4e87c03f1408400da6c522e.png)
③已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c179fe7eff7abfdd092b63c9c1b82d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e5eea5f7f98ca8632358b7e49ceb25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/768c088eb4afd194e4d6f3ef6bac9d8e.png)
④通过最小二乘法以模型
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4116a86db5067da2424b9d92e71e14a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4116a86db5067da2424b9d92e71e14a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bda105ec292aac7ab1485bd5031783fb.png)
⑤通过最小二乘法以模型
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4116a86db5067da2424b9d92e71e14a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54d28162b2a8309f0f7f193e733be414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11fd3f8b232a05d4ba000c4d10ae1271.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b341d1d30b8f27fd936a8c8069afde4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2797522e5311d516bf559c43c121eca.png)
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