有一次著名物理学家爱因斯坦病了 ,他的朋友出了一个数学问题给他作消遣 :“设想表针的位置在 1 2点钟 ,在这位置如果把时针和分针对调一下 ,它们所指的位置还是合理的 ,但是在别的时候 ,例如在 6点钟 ,两针对调就成了笑话 ,这种位置是不可能的 :当时针指 1 2的时候 ,分针决不 One famous physicist, Einstein, was ill. His friend had a mathematical problem to make fun of him: "Imagine the position of the hands at 12 o’clock. If you point the hour hand and the minute at this position, they will The position of the fingers is still reasonable, but at other times, for example, at 6 o’clock, the two targets become a joke. This position is impossible: when the needle was pointed at 1 2 , the minute hand was never