更新时间:2017-06-05 15:41:47
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解答题-问答题
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适中
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【推荐1】对于三个数a、b、c,用
表示这三个数的平均数,用
表示这三个数中的最大数;即
,例如
;若满足
,则
,例如
,
,根据上述材料,完成下列问题:
(1)
;若
,则x的取值范围为 ;
(2)若
,求x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee39764512a3b677e6e9e29f9e16cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea8d0e62da8a1420ce003729dbfeee28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb6ee327a3652d2580c9cc6fa5943fcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a1e7db602cd768d55117206d1eb2146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd7251fe46769bc877fcbdb88d47ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1338b1fe3265f5cb07c6815b942374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0d9f0d8b38d9dfecccd7f8bd647593c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41611331547a512e2809c0ee566fd3b5.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9f60faa14e7717c73d2c01d6ccea58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1f1993b21a2574510f63f6f32b60bc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aec6d5a82f8b4fe8cbf8ec8906ee045.png)
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