虽然一次函数与二次函数之间存在着本质区别,但在许多实际应用的问题中,往往需要一次函数作铺垫,然后才可以通过二次函数来求解问题。一、确定最大利润例1(2013年湖北省孝感市中考题)在“母亲节”前夕,我市某校学生积极参与“关爱贫困母亲”的活动,他们购进一批单价为20元的“孝文化衫”在课余时间进行义卖,并将所得利润捐给贫困母亲。经试验发现,若每 Although there is an essential difference between a linear function and a quadratic function, it is often necessary to pave the way for many practical problems before solving the problem with quadratic functions. First, to determine the maximum profit Example 1 (Xiaogan City, Hubei Province 2013 senior high school entrance examination questions) On the eve of “Mother ’s Day, a city school students actively involved in” care for poor mothers “activities, they purchased a number of unit price 20 yuan ”filial Culture shirt " in spare time for sale, and the profits donated to poor mothers. After the test found that if each