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2015—2016学年度我校第一学期期末考试第22题如下:某商户经销一种农产品,己知该产品的进价为每千克20元,调查发现,该产品每天的销量y(千克)与售价x(元/千克)有如下关系:y=-2x+80.设该产品每天的销售利润为w元.(1)售价为多少时,每天的销售利润最大?最大利润是多少?(2)物价部门规定该产品的售价不得高于28元/千克,该商户若要每天获利150元,售价应定为多少?笔者预测所带班此题平均得分应该在6分以上,结果仅有3.1分.大大出乎我的意料!于是进行了调
Question 22 of the final semester of the first semester of 2015-2016 school year is as follows: A merchant sells an agricultural product and knows that the purchase price of the product is 20 yuan per kg. The survey found that the daily sales of the product y (kg) The price of x (yuan / kg) has the following relationship: y = -2x +80. Suppose the product daily sales profit w. (1) What is the selling price, the daily sales of the largest profit? What is the maximum profit? (2) the price department provides that the price of the product shall not be higher than 28 yuan / kg, the business profit of 150 yuan a day, the price should be set as much? I predict the class with the average score should be 6 points or more , The result is only 3.1 points. To my surprise! So adjusted