后悔来不及打一个数字 十万火急，谁能给个答案？

后悔来不及打一个数字是“5”，因为“后悔来不及”可以用“悔不当初”来表示，“悔”字的谐音是“5”。

In English, the corresponding content would be: The number for \"it's too late to regret\" is \"5\", because \"it's too late to regret\" can be expressed as \"regret not doing it at the beginning\", and the homophone of the character \"regret\" (悔) is \"5\" (wu) in Chinese.

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