解题方法
1 . 一学生解方程
,经过
换元变形后得到
,为求解方程,他判断出方程无有理根.利用二分法,发现两个零点
满足
,他决定追踪之并分解因式,得到下表.
则下列实数中,关于x的方程的解为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e35b4867331007ef3a99c8f70dd253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7d742e1206acd2584184528a21e99b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f4bed01737f952037308d17a4243ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8e9f49a0c2862c0672ff6e12454be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cea65015d5c56a26b0fdd77f6359fd1.png)
t | 0 | 1 | 0.5 | 0.75 | 0.625 | 0.562 | 0.593 | 0.609 | 0.617 | 0.621 | 0.619 | 0.618 |
9 | 1.613 | 0.060 | 0.025 | 0.008 |
A.![]() | B.![]() | C.![]() | D.![]() |
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