名校
1 . 已知
,
,
,现有如下说法:
①
的取值范围为
; ②
; ③
;
则正确的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f39d861ee165fadd077e8d9117d2f675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfe2679dba01cd742bd5d5a139a50044.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c9d74514101c5a7ab5af12b871590a.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ad46a43f6eff68738007ff5d21d5fed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb480ce7aba3a789a28163f3eae1a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e11f34157d78dea3533f09b26be7c8e6.png)
则正确的个数为( )
A.0 | B.1 | C.2 | D.3 |
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A.0 | B.1 | C.2 | D.3 |