已知实数a、b满足(a2+b2)2-2(a2+b2)=8,则a2+b2的值为 ( )
A.-2 | B.4 | C.4或-2 | D.-4或2 |
更新时间:2016-12-05 21:53:32
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【知识点】 换元法解一元二次方程解读
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较易
(0.85)
【推荐1】实数
,
满足
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/839cdef716b7e085886364a05778e0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb194be9fe4f064204a6ead3fd5f8253.png)
A.1或-2 | B.1 | C.1或2 | D.1或4 |
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