二次三项式ax~2+bx+c,一元二次方程ax~2+bx+c=0,二次函数y=ax~2+bx+c,一元二次不等式ax~2+bx+c>0(或<0)虽然研究的重点不同,但它们的一般形式都是用ax~2+bx+c(a≠0)来表示的,这就是它们的共性,因此存在着密切的联系,复习时首先要抓住共性,揭示知识的内部联系,形成“知识链”。二次三项式的因式分解问题,对应于一 The quadratic term ax~2+bx+c, the quadratic equation ax~2+bx+c=0, the quadratic function y=ax~2+bx+c, the quadratic inequality ax~2+bx+ c>0 (or <0) Although the research focuses are different, their general form is represented by ax~2+bx+c(a≠0). This is their commonality, so there is a close connection between them. When reviewing, we must first grasp the commonality, reveal the internal links of knowledge, and form a “knowledge chain.” The factorization of quadratic trinomials corresponds to a