重点难点易混易错点剖析复习重点:二次函数的图象、性质和应用,二次函数与一元二次方程、一元二次不等式的关系.复习难点:求二次函数的解析式,求抛物线的对称轴、顶点坐标,能够构造二次函数模型解决实际中的最值问题.易混易错点:二次函数图象与系数的关系,由抛物线y=ax~2+bx+c的开口方向和对称轴确定a、b的符号,由抛物线与y轴的交点位置确定c的符号,由抛物线与x轴的交点个数确 The key points are easy to be easy to analyze the wrong points: the quadratic function of the image, the nature and application, the quadratic function and the quadratic equation quadratic, unary quadratic inequality review difficult: Parabola axis of symmetry, vertex coordinates, quadratic function model can be constructed to solve the most practical problems. Easy to misclassify points: quadratic function image and the relationship between the coefficients, from the parabola y = ax ~ 2 + bx + c The direction of the opening and the axis of symmetry determine the sign of a, b. The symbol of c is determined by the intersection of the parabola and the y-axis. The number of intersections between the parabola and the x-axis