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关于一个数的绝对值问题,不同于一般的求代数式的值,它变化多端,初学之际颇感困惑.必须多加思考,方能辨析清楚.本文列举同学解题的失误之处,编成问题
The problem of the absolute value of a number is different from that of ordinary algebraic expressions. It varies greatly and it is rather confused at the beginner’s time. It must be considered more clearly before it can be clearly identified.