J4 ›› 2011, Vol. 10 ›› Issue (4): 17-20.
换元法是中学数学中较为重要也是常见的方法，对局部换元，三角换元，均值换元等进行深入探究是教学中的一个重要环节。巧妙地运用换元法将问题进行转化和化归，使问题的解答更加简洁明了。
Substitution method is frequently used to solve mathematical problems in middle school teaching．Researches into partial substitution，triangular substitution and mean substitution are important parts of mathematics teaching．By using substitution methods， problems could be transformed and solutions could become clear．
