我们知道,抛物线y=ax2+bx+c(a≠0)是关于直线x=-b/2a对称的轴对称图形.由轴对称图形的性质可知,若垂直于对称轴的直线与抛物线相交于两点,则这两点必关于对称轴对称.特别地,当抛物线与x轴相交于两点时,两 As we know, the parabola y = ax2 + bx + c (a ≠ 0) is an axisymmetric figure about the symmetry of the line x = -b / 2a. It can be seen from the nature of the axisymmetric figure that if a straight line perpendicular to the axis of symmetry intersects the parabola at Two points, then the two points must be symmetrical about the axis of symmetry.In particular, when the parabola and the x-axis intersect at two points, two