经过任意不在一条直线上三点,可以确定一条抛物线,把三角形关于一点作位似变换(放大k倍,或者是缩小到原来的1/k,其中k是任意正实数),可以得出变换后的三角形三个顶点的坐标,因此可以确定位似变换后经过三点的抛物线的解析式.1关于原点的位似变换例已知二次函数解析式是 After any point not in a straight line at three o’clock, a parabola can be identified, and the triangle is bit-transformed (multiplied by k times, or reduced to the original 1 / k, where k is an arbitrary positive real number) about a point, The coordinates of the three vertices of the triangle, so you can determine the bit-like transformation of the parabolic three points after the analytic.1 bit transform on the origin known quadratic function analytic is