北师大版高中数学必修5中介绍了利用“穿针引线”法求一类整式不等式(包括可转化为整式不等式的分式不等式)的解集.下面就此方法的来源以及在运用中应注意的问题谈谈本人的一些认识.利用“穿针引线”法解整式不等式非常直观、简捷,它避开了分区间研究的繁琐运算,给学生的学习带 Beijing Normal University Mathematical Conformance 5 introduces the use of the “needle-in-lead” method to solve a set of integral inequalities (including fractional inequalities that can be converted to integral inequalities). Here are the sources of these methods and the issues that should be addressed in their use. Talk about some of my own understanding. The use of “threaded lead” method to solve the integral inequality is very intuitive and simple, it avoids the cumbersome calculations of the study between the partition, to students with learning