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这是第七届华杯赛的试题. 多个未知数(1999个),多个方程(1999个),不能用常规的消元法逐个消元.需要仔细观察,根据方程组的特点来解.
This is the seventh Chinese Cup test. Multiple unknowns (1999), multiple equations (1999), can not be eliminated one by one using the conventional elimination method. Need to be carefully observed, according to the characteristics of the equation group to solve.