最近我们学习了分式、分式的基本性质、分式的乘除法、分式的加减法等内容 ,我们发现分式运算的策略性很强 .即是说选择解题的大方向很重要 .若策略好 ,则运算简捷 ,如果策略不好 ,可能运算会十分繁琐 .这些策略包括 :求值时应先化简再代值的策略 ;分式加减法 ,应先尽可能化成 Recently, we have studied the basic properties of fractions, fractions, multiplication and division of fractions, addition and subtraction of fractions, etc. We have found that fractional operations are very tactical. That is to say, the general direction of the selection problem is very important. If the strategy is good, then the operation is simple. If the strategy is not good, the operation may be very tedious. These strategies include: First, the strategy of reducing the value of substitutes should be used in the evaluation; The addition and subtraction of fractions should be performed as soon as possible.