(1) y = a(x + 2)(x - b)A(-2, 0), B(b, 0), AO = 2tan∠CAB = OC/OA = OC/2 = 2, OC = 4C(0, 4)x = 0, y = -2ab = 4, ab = -2显然缺少条誉配大灶件。庆仿指
抛物线 ))(2(bxxay 是什么意思?