解法一:(1)根据题意,当销售利润为4万元,销售量为(万升). 答:销售量为4万升时销售利润为4万元.············································· (3分) (2)点的坐标为,从13日到15日利润为(万元), 所以销售量为(万升),所以点的坐标为. 设线段所对应的函数关系式为,则解得 线段所对应的函数关系式为.························· (6分) 从15日到31日销售5万升,利润为(万元). 本月销售该油品的利润为(万元),所以点的坐标为. 设线段所对应的函数关系式为,则解得 所以线段所对应的函数关系式为.·························· (9分) (3)线段.··············································································· (12分) 解法二:(1)根据题意,线段所对应的函数关系式为,即. 当时,. 答:销售量为4万升时,销售利润为4万元.············································· (3分)
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