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不等式的恒成立问题作为近年来高考的热点题型,是高三复习课不等式部分的重点内容.其中,不等式在某个定区间内恒成立是难点.对于这类问题,笔者发现学生热衷于“代区间端点”解决问题,殊不知“代端点”得到的条件只是原命题成立的必要条件,用来解题有失偏颇,很难得到正确答案.但是,是不是这样的解题过程就一无是处呢?正所谓
Inequalities in the establishment of a constant problem as the entrance examination hot topics in recent years, is the third part of the inequality of the review section of the key elements of which inequalities in a given interval constant establishment is difficult.For these problems, I found that students are keen to Generation of end-point “to solve the problem, do not know ” on behalf of the endpoint "the conditions obtained are the necessary conditions for the establishment of the original proposition, used to solve the problem is biased, it is difficult to get the correct answer.However, is it right? What does it mean?