抛物线与面积“同行”的问题在初中数学学习中屡见不鲜.解答其关键在于先确定抛物线的解析式,然后求出或用字母表示某些特殊点的坐标.例1如下图,抛物线y=a(x-1)2+4与x轴交于点A、点B,与y轴交于点C.过点C作CD∥x轴,交抛物线的对称轴于点D,连接BD.已知点A坐标为(-1,0). The problem of parabola and area “peer ” is not uncommon in junior high school mathematics learning.The key is to determine the parabola’s analytic formula, and then find or alphabetic coordinates of some special points.Example 1 As shown in the following figure, the parabola y = a (x-1) 2 + 4 intersects the x axis at point A, point B, and the y axis intersects at point C. After point C as the CD // x axis, the symmetry axis of the parabola intersects at point D and connects BD. Point A coordinates for the (-1,0).