[sage-support] How to get an expression in the form (n+1)/(n−k+1) instead of -(n+1)/(k−n−1)?

[lv航宇]

我想知道为什么下面的代码以 -（n + 1）/（k - n - 1） 的形式计算结果。有没有办法让它返回类似于 （n + 1）/（n - k + 1） 
的形式？
'''python
_ = var（'k n'）
假设 （n > k）
假设 （n - k + 1 > 0）
结果 = （n + 1）/（n - k + 1）
结果
```
提前感谢您的帮助！

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