笔者最近对二次函数的图象作了研究,得到了一组重要而有趣的结论,现论述如下,供读者参考.定理设二次函数y=ax2+bx+c(ac≠0,Δ=b2-4ac>0)的图象和x轴的两个交点为A, The author recently studied the image of quadratic functions and obtained a series of important and interesting conclusions, which are presented as follows for readers’ reference. Theorem Let quadrature function y = ax2 + bx + c (ac ≠ 0, Δ = b2-4ac> 0) and the intersection of the two axes of the x-axis is A,