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数学王国里有一座迷宫,要从迷宫外面进入迷宫中心,得经过三道门,并且要使得经过的三道门上的数字,通过适当的运算(加法或减法)得到500。哪只小动物可以进入迷宫中心呢?
There is a maze in the kingdom of mathematics. To enter the maze center from outside the maze, go through three gates and make the numbers on the three lanes go through 500 for proper arithmetic (addition or subtraction). Which animal can enter the maze center?