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当你在吃菠萝的寸候,你可能不知道,菠萝呈螺旋形的外壳竟然和一个神奇的数列有关。不仅菠萝,很多植物的花瓣、叶子、花蕊、种子的数目都与一个数列有关。像梅花是5片花瓣,李树也是5片花瓣,鸢尾花是3片花瓣,许多翠雀属植物的花瓣是8片,万寿菊的花瓣有1 3片。这些数字如果排列起来,就是3、5、8、13……你发现了什么规律吗?那就是这些数字的前两个之和等于第三个,这就是斐波那契数列。它是中世纪的意大利数学家斐波那契提出的。最初的问题是:假设兔子的生殖规律是每一对兔子出生两个月后就具有生殖能力,每对成年兔子每个月可以生一对兔子。那么由一对兔子开
When you’re eating pineapple, you probably do not know that the pineapple’s helical shell is about a magical sequence. Not only pineapples, many plant petals, leaves, stamens, the number of seeds are related to a series. Like plum is 5 petals, plum is 5 petals, iris is 3 petals, many Delphinium petals are 8, marigold petals have 13 pieces. These numbers, if arranged, are 3, 5, 8, 13 ... What rule did you find? That is, the sum of the first two of these numbers equals the third, which is the Fibonacci sequence. It was proposed by the medieval Italian mathematician Fibonacci. The initial problem is: Suppose the rabbit’s reproductive law is that each pair of rabbits have reproductive capacity after two months of birth, and each pair of adult rabbits can produce a pair of rabbits each month. Then by a pair of rabbits to open