已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a8d7cd0a79d73e097f1cd40b615ec0e.png)
_________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42bbd37e2223bd111277a2818125506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a8d7cd0a79d73e097f1cd40b615ec0e.png)
17-18八年级下·全国·单元测试 查看更多[4]
更新时间:2020-10-04 00:00:26
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