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一天,小明对小兰说:“请你随意写出一大一小两组数,我会一下子算出它们的和减去它们的差的结果来!”“真的吗?”小兰惊奇地问。“那当然,请出题吧!”小明自信地说。
One day, Xiaoming said to Xiaolan: “Please write a group of two numbers one at a time and two at any time. I will calculate their sum at once and subtract the difference between them!” “Really?” Xiaolan was surprised ask. “Of course, please give a question!” Xiao Ming said confidently.