在进行二次根式的运算时 ,往往需要把分母有理化 ,而分母有理化的方法则是把分子、分母同乘以分母的有理化因式 ,因此分母有理化的关键是找分母的有理化因式。我们清楚 ,两个含有二次根式的代数式相乘 ,如果它们的积不含有二次根式 ,就说这两个代数式互为有理化因式。由此可知 In the calculation of secondary roots, it is often necessary to rationalize the denominator, and the rationalization of the denominator is to rationalize the factorization of the denominator by rationalizing the factorization of the denominator by numerator and denominator. Factor. We know that the two algebraic formulas that contain quadratic roots are multiplicative. If their products do not contain quadratic roots, they are said to have a rational factor. It can be seen