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“换元法”是初中数学重要的思想方法,此法如应用得当,则可使解题过程简捷,提高解题速度.本文介绍数学竞赛中三种常见的换元法.
The “substitution method” is an important thought method for junior high school mathematics. If this method is applied properly, it can make the problem-solving process simple and quick, and speed up problem-solving. This paper introduces three common substitution methods in math competition.