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《字母表示数》这一章的总体要求是,在生活实践中理解用字母表示数的意义,能通过分析实际问题中的数量关系列出相应的代数式,并会求代数式的值.理解同类项的意
The general requirement of this chapter is to understand the meaning of alphanumeric characters in daily life and to list the corresponding algebraic expressions by analyzing the quantitative relationships in practical problems and to find algebraic values. The meaning of