在网上看到一道“脑筋急转弯”式的智力题:荷塘里有一片荷叶,它每天会增长一倍,假使30天会长满整个荷塘,请问,第28天荷塘里有多少荷叶?从前往后推,答案让人吃惊:因为,此时只有四分之一荷塘的荷叶。但是,第29天就会长满一半,第30天就会长满整个荷塘。其实,荷叶每天的生长速度都是一样的。然而,前28天只不过 On the Internet to see a “brain teaser” type of intellectual questions: There is a lotus leaf lotus leaf, which will double daily, if the 30 days will be filled with the entire lotus pond, excuse me, how many Dutch in the 28th lotus From the front to the back push, the answer is astonishing: because at this time only a quarter lotus leaf lotus. However, by the 29th day it will grow by half and by the 30th day it will grow by the entire lotus pond. In fact, the daily growth rate of lotus leaf are the same. However, the first 28 days only