对有理数的运算,不但要熟练掌握其法则,还要善于运用运算技巧.要注意根据算式的结构特征,灵活选用一些运算律和运算法则,将问题化繁为简,化难为易,使运算过程迅捷简便,收到事半功倍的效果.现举例介绍有理数运算的几个常用技巧. Rational numbers of operations, not only to master their laws, but also good at using computing skills. Attention should be paid according to the structural characteristics of the formula, the flexibility to use some algorithms and algorithms, the problem of simplification, the difficulty is easy, so that the process of computing Quick and easy, receive a multiplier effect. Now introduce some examples of rational number of commonly used arithmetic skills.