与分式有关的求值问题是历年中考的一个重要考查内容．在2005 年全国各地市的中考试题中,关于这部分知识的考题出现了一些新颖别致的题型,较好地考查了同学们深层次、多角度地分析题意及挖掘隐含条件求解问题的能力,现撷取几例予以说明,以帮助大家掌握这类问题的求解方法． The question of evaluation related to fractions is an important part of the examination in the calendar year. In the middle school examination questions in various cities across the country in 2005, there were some novel and unique questions on this part of the knowledge examination, which better examined the students’ deep-seated and multi-angle analysis of the meaning and mining of hidden conditions to solve problems. Ability, now to learn a few examples to help you master the solution to this type of problem.