无理分式的分母有理化是中学数学的重要内容．对于形如Ａａ１３ｂ１＋ａ２３ｂ２和Ａａ１３ｂ１＋ａ２３ｂ２的分母有理化，利用平方差和立方差分式，很容易解决；对于形如Ａａ１３ｂ１＋ａ２３ｂ２＋ｃ的分母有理化，两次利用平方差公式就能解决；但对于形如Ａａ１３ｂ１... The unreasonable denominator is an important part of high school mathematics. For the form of the denominator such as Aa13b1 + a23b2 and Aa13b1 + a23b2, the use of the square difference and the cubic difference is easy to solve; for the shape of the denominator such as Aa13b1 + a23b2 + c rationalized twice by the square error formula can be solved;