它是中学数学重要的基本思想方法之一，是一种从特殊到特殊的推理方法。
It is one of the important basic thought ways in the middle school mathematics, and is also kind of from exception to the exceptional inference method.
认为中国古代数学家求解这类问题的基本思想方法是设法减少题目中未知元的个数，使不定解的问题转化为确定解的问题。
It points out that the main idea of ancient Chinese mathematicians for calculating such problems was to change an indeterminate problem into a determinate one.
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