化简:
=______ ;
=_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b56957b1fdcac86bdc510069da622315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d92c5cb0c338ea2cf42b0cd72fd87310.png)
更新时间:2016-12-05 09:03:02
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【知识点】 代数式