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白发先生是个“数学迷”.今天,他又玩起了新花样.起先他关注数字81,后来又对2007这个数字感兴趣.他一边操作计算器,一边记录计算结果.不一会儿,纸上就写满了算式.
Mr. Bai Fa is a “Mathematical fan.” Today, he played a new trick. At first he focused on the number 81, but later he was interested in the 2007 number. He operated the calculator and recorded the results. The paper is full of arithmetic.