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每届“希望杯”赛总有不少适合中学生实际,又能锻炼中学生能力,激发中学生研究兴趣的好题.下面即是一例.
In each “Hope Cup” competition, there are always many good questions that suit the actual conditions of middle school students, and they can also develop the ability of middle school students to stimulate the research interests of middle school students. The following is an example.