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1.用字母表示数时,应注意些什么问题? 答 (1)在同一问题中,同一个字母只能表示同一个数,不同的数要用不同的字母表示.
1. What questions should be noted when using letters to represent numbers? A. (1) In the same question, the same letter can only represent the same number, and different numbers must be represented by different letters.