若x1，x2是方程ax2－bx＋c＝0（a≠0）的＋bC＋C一0（a≠0）的两个根．这就是一元二次方程根与系数的关系，我们利用其可以解决很多与“二次”有关的问题．一、已知一元二次大程的一个根，求另一个根例1（I）已知4X2－11x＋6＝0的一根是Z，求另一根；（2）已知一2是方程Zx’＋m If x1,x2 are the two roots of +bC+C-0 (a≠0) of the equation ax2-bx+c=0(a≠0). This is the relationship between the root and the coefficient of a quadratic equation, and we can use it to solve many problems related to “secondary”. One is known as a root of a second universal process. Find another root. Case 1 (I) Known that one of 4X2-11x+6=0 is Z, find the other; (2) Known that 2 is the equation Zx ’+m