Quadratic Equation Roots
一元二次方程表示为 ax2 + bx + c = 0.求它的根（y = 0 的 x 值）的一般公式是 ：
这个公式提供了两个根： x1, x2.平方根内的值 b2-4ac称为判别式 (D)。根据判别式的值，一元二次方程可以有 ：
- 两个不同的实数根 (
D> 0)； - 一个实数根 (
D = 0)； - 没有实数根 (
D < 0)。
您的代码必须返回Iterable ，其中包含两个值：根 x1, x2，按降序排序。如果只有一个实数根，两个值将相同。如果没有实数根，Iterable 应包含字符串"No real roots" 。
输入：...
CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.
In order to install CheckiO client you'll need installed Python (version at least 3.8)
Install CheckiO Client first:
pip3 install checkio_client
Configure your tool
checkio --domain=py config --key=
Sync solutions into your local folder
checkio sync
(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)
checkio serv -d
Alternatevly, you can install Chrome extension or FF addon
checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium
Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.
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