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二次函数中含参问题是中学数学中的重点难点问题,同时也是高考的热点问题之一,我们经常会遇到有关二次函数中含参恒成立问题．本文通过举例介绍几种常见的解这类题的方法以期抛砖引玉．
The parametric problem in the quadratic function is a key and difficult problem in middle school mathematics, and it is also one of the hot issues in the college entrance examination. We often encounter problems concerning the establishment of a parametric constant in a quadratic function. This article introduces several common ways to solve such problems by way of example in order to throw a brick to attract jade.