名校
1 . 设
,数列{xn}满足
.若1≤x7≤2,则x8的取值范围为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6dc6b2701de8807efd7cc22e1f21af7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68513f125e6766a039eab3ab01cce834.png)
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解题方法
2 . 已知实数
满足
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda10fa4eb4ada28d582363540b3dc3a.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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