论文部分内容阅读
给出不等式(组)求解集大家一般较熟练,可给出不等式(组)解(集)或其情形,要求确定其待定系数的值、范围或关系式的问题就比较棘手,极易出错(特别是等号的取舍),它是近年各地中考数学试题中经常出现的题型,本文给出一般解法.一、确定不等式(组)系数的值当给出不等式(组)的解集求系数的值时,一般先求出不等式(组)的解集(用系数表示),再根据它与已知解集的对应关系构造方程(组)即可确定不等式中系数的值,进一步还可以求
Given inequality (group) set of solutions, we are generally more skilled, given the inequality (set) solution or its situation, the problem of determining the value, range or relationship of the coefficient to be determined is more difficult and error prone Especially the choice of equals sign), which is a recurring problem in the math test questions in recent years, this article gives a general solution.First, to determine the value of the inequality (group) coefficient When given the inequality The value of the coefficient in the inequality can be determined by constructing equations (groups) according to its corresponding relationship with the known solution set, and further finding the solution set of the inequality (group)