函数是初中数学的主干知识,函数应用题一直是中考命题的重点.成本最低、利润最高、产量最大、效益最好、用料最省等实际问题是函数命题的重点.下面结合2012年中考试题,对函数应用题进行分类解析.一、图像信息类例1(2012年广安卷)时钟正常运行时,时针和分针的夹角会随着时间的变化而变化.设时针与分针的夹角为y(度),运行时间 Function is the backbone of junior high school mathematics knowledge, function problem has been the focus of the test.The lowest cost, the highest profits, the largest output, the best benefit, the most practical materials and other practical problems is the focus of the function proposition. First, the image information Example 1 (2012 Kwong Juan) Clock normal operation, the angle between the hour hand and the minute hand will change with time changes set the angle between the hour hand and the minute hand is y (degrees), running time