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近年来,高考命题中有关“恒成立”问题频频出现,对“恒成立”这一条件的转化,处理方法愈来愈明确、完善,但不少问题中“恒成立”条件含而不露,这时,能否挖掘出这一条件成为解题成败的关键.本文拟从函数有关定义出发,谈谈如何挖掘其中隐含的“恒成立”条件,以帮助学生加深对概念的认识,提高解题能力.一挖掘“定义域”概念中的“恒成立”条件
In recent years, problems related to “constant establishment” in the college entrance examination proposition have frequently appeared. The transformation of the condition of “constant establishment” has become clearer and more complete. However, the conditions for “constant establishment” in many problems are not revealed. At this time, whether or not this condition can be excavated becomes the key to the success or failure of the problem. This article intends to proceed from the definition of functions, and talk about how to explore the hidden “constant establishment” conditions to help students deepen their understanding of concepts and improve solutions. Questions ability. A mining “constant establishment” condition in the concept of “domain”