分母有理化是一种极其重要的恒等变形,它广泛应用于根式的计算和化简,除掌握基本方法外,需根据不同题的特点,灵活应用解法, The rationalization of the denominator is an extremely important constant deformation. It is widely used in the calculation and simplification of the root. In addition to the basic methods, it is necessary to apply the solution flexibly according to the characteristics of different questions.