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在0～9这十个数字中“0”和“1”由于有一 些特殊性质而倍受青睐,殊不知在解决某些 问题时,“2”的作用也是举足轻重的．下面就 谈谈如何利用“2”来解决一类竞赛题．
Among the ten figures from 0 to 9, “0” and “1” are favored due to their special properties, but they do not know that “2” plays a decisive role in solving certain problems. Here’s how to use “2” to solve a type of competition problem.