已知:
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abff9f5a1819d001d712e3eb6b76597.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91bde66645c9abf9e847ea67854c14a6.png)
A.1 | B.2 | C.-2 | D.-1 |
更新时间:2020-12-05 22:47:47
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