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下午第三节课,初一(1)班“数学兴趣小组”的活动开始了.组长小明在黑板上写下这次活动的主题:“平方差与自然数”.接着他说:“天津市
In the third class of the afternoon, the activities of the “Mathematics Interest Group” of the first class (1) began. The team leader Xiao Ming wrote the theme of the event on the blackboard: “Square difference and natural number.” Then he said: “Tianjin