郑大zzu胡馨元提出了问题
2020-02-10 19:37
```tex begin{theorem}{达布定理} $text{设}fleft(xright)text{在}left[a,bright]text{上可导},$ $text{且}f'_-left(aright)text{与}f'_{+}left(bright)text{不相等},$ $ctext{是夹在}f'_-left(aright)text{与}f'_{+}left(bright)te...