名校
解题方法
1 . 下列命题中,真命题的个数是( )
①函数
与
是同一个函数;②若
,则
或
;③若随机变量
,
,则
;④在回归分析模型中,残差的平方和越大,模型的拟合效果越好.
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f45277177aef29b0eb3a06492f8ea342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a34982de5d3f287cd570ea30eb46d185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30c903d8f8a05332af0b19e7e40df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/515713922221bfa136afa32822bb7ad1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d03a75d06f9ffdb5b5cae81f53230b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7387b7fc7b5b2c23b8df2a283d553f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c8fac9ced5bb57dde51f4405307c93.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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