已知
=2,则
=________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43650cd04f9c5c3ad73ded787df0f2a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc32ce5a2b12e48f8a4707ecb3b057b.png)
更新时间:2020-09-23 10:37:30
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【知识点】 通过对完全平方公式变形求值解读