含参数的恒成立问题是高中数学中的一类重要题型,它常以各种载体出现在高考和各类竞赛试卷中.此类问题以一主元和若干参变元伴随着显性或隐性的题型出现,考生若能抓住它们“形异质同”(“形异”即题型各不相同,“质同”即实质相同,就是要抓住主元.)构造目标函数,就可成功解答此 The constant establishment problem with parameters is an important type of problem in high school mathematics. It often appears in college entrance examinations and various competition examination papers with various kinds of carriers. Such problems are accompanied by dominant or several parameter variables. Implicit question types appear, and if candidates can grasp them, they are “different” (“different” or “different” or “substantially identical” is essentially the same, that is, they must seize the principal element.) Constructing the objective function , you can successfully answer this