先化简,再求值
,其中
,
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f17aff998e7c18643946ea6c8c642032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22a4a0dd7307a1323d25331e60782d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
更新时间:2021-11-20 07:55:47
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【知识点】 整式的加减中的化简求值解读