解题方法
1 . 已知
,
,
,且计算可知
.有下述四个结论:
①
, ②
,
③
, ④
.
其中所有正确结论的编号是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3def0b5a4de063ffb641c6c83cab983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a072050dbd07045a5d962679a7ddbdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3777c239bf0dfe102fcf2f1163e6414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/328742eb89d7cf53fff45d6cbc0ddae9.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e40ca3c8ad11bd9df5be9e49f6532241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3518f01443634bcf94ea604aacb34c1.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4924f7d3087c2be35e8501a5476bb98b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ccc3bb7f9ab99318d01c36f6cca17da.png)
其中所有正确结论的编号是( )
A.①③ | B.①④ | C.②④ | D.①②③ |
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