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I can't work out the third problem of my last math problem. Is there any good way?
First of all, the final integration of the third question in the college entrance examination is a good way to widen the gap, that is, to do something difficult without problems in the previous questions. At that time, we only did the last question in Huanggang or the slightly simple question in the Olympic Games every day, but it was a waste of time and needed teachers.