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重点难点易混易错点剖析本节学习的重点是二次函数y=ax~2+bx+c(a,b,c为常数,a≠0)的图象、性质,与一元二次方程之间的关系,以及在实际问题中的应用.难点是构造二次函数模型探求实际问题的最值.易混易错点主要是:不理解一般式中字母系数的几何意义,错用函数增减性,忽略实际问题中自变量取值范围的限制条件,缺乏分类
Key points are easy to misunderstand the point of error analysis of this section The study is focused on the quadratic function y = ax ~ 2 + bx + c (a, b, c is a constant, a ≠ 0) images, properties, and one yuan quadratic equation The relationship between the two, and the application in practical problems. The difficulty is to construct the quadratic function model to find the best value of the actual problem. Misleading points are: do not understand the geometric meaning of the letter coefficients in the general formula, misuse function increase Subtraction, ignoring the constraints of the range of independent variables in actual problems, lack of classification