一元二次方程的根与系数之间存在下列关系:如果ax~2+bx+c=0(a≠0)的两个根为x_1、x_2,那么x_1+x_2=-b/a,x_1x_2=c/a.这个关系通常称为韦达定理(Victa’s theorem)学习时,我们要准确理解一元二次方程的根与系数的关系,把握其本质特征,理顺两根x_1、x_2与系数a、b、c之间的相互关联.而要全面准确地理解一元二次方程的根与系数的关 The following relationship exists between the root and the coefficient of a quadratic equation: If two roots of ax ~ 2 + bx + c = 0 (a ≠ 0) are x_1, x_2, then x_1 + x_2 = -b / a, x_1x_2 = This relationship is usually called Victa’s theorem. When learning, we need to understand exactly the relationship between the root and the coefficient of a quadratic equation. Grasp the essential features of the quadratic equation, straighten out two x_1, x_2 and the coefficients a, b, c, but to fully and accurately understand the root and coefficient of the quadratic equation