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fix wrong format #1

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2 changes: 1 addition & 1 deletion 02-Algebra/五次以上多項式沒有公式解.md
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### 五次方程式的公式解

如上所述，《二次多項式》的公式解如下為 $`x = \frac{-b \pm \sqrt {b^2-4ac}}{2a}`$，《三次多項式》和《四次多項式》也有公式解，雖然解的形式越變越複雜，但是我們有辦法一直往上，寫出五次，六次，七次一直到 n 次多項式的公式解嗎？
如上所述，《二次多項式》的公式解如下為 $x = \frac{-b \pm \sqrt {b^2-4ac}}{2a}$，《三次多項式》和《四次多項式》也有公式解，雖然解的形式越變越複雜，但是我們有辦法一直往上，寫出五次，六次，七次一直到 n 次多項式的公式解嗎？

很可惜的，這件事情已經有人證明是做不到的了，證明的人是 [阿貝爾](https://zh.wikipedia.org/wiki/%E5%B0%BC%E5%B0%94%E6%96%AF%C2%B7%E9%98%BF%E8%B4%9D%E5%B0%94) 和 [伽羅瓦](https://zh.wikipedia.org/wiki/%E5%9F%83%E7%93%A6%E9%87%8C%E6%96%AF%E7%89%B9%C2%B7%E4%BC%BD%E7%BD%97%E7%93%A6)，他們分別利用群論的方式，證明了而五次以上的多項式沒有公式解，詳情請看下列連結：

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