一元二次方程根与系数的关系在解题中应用非常广泛.为帮助同学们准确地运用这个定理,本文提醒大家注意以下几个问题:一、注意a≠0和Δ≥0在应用一元二次方程根与系数时,必须要注意二次项系数a不能为0,并且根的判别式Δ大于或等于0.例1已知x1,x2是一元二次方程4kx2-4kx+k+1=0的 The relationship between the root and the coefficient of the quadratic equation is very widely used in the problem solving. To help the students to use this theorem accurately, this paper reminds everyone to pay attention to the following questions: First, pay attention to a≠0 and Δ≥0 in the application of a two yuan When the secondary equation root and coefficient, we must pay attention to the second term coefficient a can not be 0, and the root of the discriminant Δ is greater than or equal to 0. Example 1 is known x1, x2 is a quadratic equation 4kx2-4kx+k+1 = 0’s