先化简,再求值:
,其中a=1+
,b=1﹣
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641ec623ef90f69511177e10dcfcb46e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
更新时间:2016-12-06 12:42:36
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【知识点】 二次根式