近年来的中考中,经常遇到一些最值应用题.解答它们,方法因题而异.其中,有的需要联合利用一次函数和二次函数的知识.现以中考题为例介绍如下,供参考.例1(2012年本溪市)某工厂生产某品牌的护眼灯,并将护眼灯按质量分成15个等级(等级越高,灯的质量越好.如:二级产品好于 In recent years, the senior high school entrance examination, often encountered some of the most value applications. Answer them, the method varies. Among them, some need to jointly use the knowledge of the linear function and quadratic function. Reference Example 1 (Benxi City, 2012) A factory produces a brand of eye-protection lamps and divides the eye-protection lamps into 15 grades according to their quality (the higher the grade, the better the quality of the lamps.) The secondary products are better than