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已知抛物线经过的三点坐标,或者是已知抛物线的顶点坐标及另外一点坐标,不难确定抛物线的解析式;如果已知抛物线经过的两点坐标及抛物线的对称轴,也可以确定抛物线的解析式;已知抛物线经过的两点坐标与抛物线顶点到x轴(或y轴)的距离也可以确定抛物线的解析式.下面结合中考题进行分析.一、已知抛物线经过的两点的坐标及对称轴
It is not difficult to determine the analytical form of the parabola if we know the coordinates of the three points that the parabola passes or the coordinates of the vertices of the known parabola and the coordinates of the other point. If we know the two coordinates of the parabola and the symmetry axis of the parabola, we can also determine the parabola Analytic formula; Known parabola after two coordinates and the parabola vertex to the x-axis (or y-axis) distance can also be determined parabolic analytic formula below with the examination questions for analysis. First, the coordinates of the known two points through the parabola And the axis of symmetry