代数中的一些分式、根式的计算化简或解分式方程、根式方程,若按一般的解法有时会很繁,也容易出差错,若能仔细观察,分析其特点,巧妙地拆项、裂项,将会使运算简捷、方便、正确,起到事半功倍的效果,同时也能培养学生思维的灵活性和学习数学、钻研数学的兴趣. Some fractions in algebra, root calculations or solutions to fractional equations, and root equations can be very confusing if they are based on general solutions. It is also prone to errors. If you can observe them carefully, analyze their characteristics, and deconstruct the items carefully. Breaking the item will make the operation simple, convenient, and correct, and it will have a multiplier effect. At the same time, it will also cultivate students’ flexibility of thinking and their interest in mathematics and mathematics.