化归思想是一种重要的思维模式,也是解决数学问题的一种重要的思想方法.所谓化归思想,就是在数学研究中,不妨对原问题换一个方式、一个角度或一种观点考虑,在新的方式、新的角度或新的观点下,有可能会使原问题变得易于解决.下面将以含参二次函数的恒成立问题为例,谈谈 To return to thinking is an important mode of thinking, but also an important way of thinking to solve mathematical problems.The so-called return to thought, that is, in mathematical research, may wish to change the original problem for a way, a point of view or a perspective, In the new way, new point of view or new point of view, it may make the original problem becomes easy to solve the following will be parametric quadratic function constant problem as an example, to talk about