回帖：通分（reduction of fractions to a common denominator）根据分数（式）的基本性质，把几个异分母分数（式）化成与原来分数（式）相等的同分母的分数（式）的过程，叫做通分 [1]  。
https://baike.baidu.com/item/%E9%80%9A%E5%88%86/1613474?fr=aladdin