近年来,在与函数有关的综合题中探求平行四边形顶点坐标的问题常见于各地中考试题.此类试题综合性强,难度较大,需要根据已知条件及平行四边形的性质进行分析探究.1.已知2顶点坐标,且构成一边.例1(2012年恩施)如图1-1,已知抛物线y=-x2+bx+c与一直线相交于A(-1,0),C(2,3)两点,与y轴交于点N. In recent years, the problem of finding the coordinates of the parallelogram vertices in the comprehensive questions related to the functions is common in all the middle school exam questions.This kind of questions is comprehensive and difficult, and needs to be analyzed and studied according to the known conditions and the properties of the parallelogram.1 . Known 2 vertex coordinates, and form one side. Example 1 (Enshi 2012) As shown in Figure 1-1, it is known that the parabola y = -x2 + bx + c intersects a straight line at A (-1,0), C 2,3) Two points, and the y-axis intersection at point N.