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新课程标准要求学生“能够根据具体问题中的数量关系列出方程,体会议程是刻画现实世界的一个有效的数学模型”。列方程时,恰当地设未知数很重要。
The new curriculum standard requires that students “be able to list equations based on quantitative relationships among specific questions and understand that an agenda is an effective mathematical model that characterizes the real world.” When formulating equations, it is important to set the unknowns properly.