纵观近年各地中考题,开放性的问题受到普遍关注,用数学知识解决实际问题的“应用题”数量增多.有理数是代数中最基本、最重要的内容,在近几年的中考命题中,对这部分知识的考查主要涉及以下几个知识点.现以2005年～2006年中考题为例说明如下.一、比较数的大小例1(湖南省长沙市中 Looking at the examination questions in various places in recent years, the open question has received widespread attention, and the number of “application questions” that use mathematical knowledge to solve practical problems has increased. Rational numbers are the most basic and most important content in algebra, and in recent years, the examination propositions, The examination of this part of the knowledge mainly involves the following knowledge points. Now take the 2005-2006 mid-term exam questions as an example to illustrate as follows. First, the size of the comparison number Example 1 (Changsha City, Hunan Province