(1)化简 :
;
(2)先化简,再求值:
;其中 a 2 ,b
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4b3c233c79bd776fe6f4c0612ac384b.png)
(2)先化简,再求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fed7174962f2b44d6cc99a531b92ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
更新时间:2019-09-09 16:23:41
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【知识点】 整式的加减中的化简求值解读