过两个定点的抛物线的中考试题有两类,一类是给出两个定点,考查过这两个定点抛物线的性质;另一类是给出过两个定点抛物线的解析式,考查抛物线的性质,本文试解决这些问题.一、给出两个定点,探究过两个定点抛物线的性质例1(2015年福州市第10题)已知一个函数图像经过(1,-4),(2,-2)两点,在自变量x的某个取值范围内,都有函数值y随x的增大而减小,则符合上述条件的函数可能是 There are two types of parabola examination questions that pass two fixed points. One is to give two fixed points, and the nature of the two fixed point parabola is examined; the other is to give an analytical expression of two fixed-point parabola, and the parabola is examined. Nature, this paper tries to solve these problems. One, given two fixed points, explored the nature of two fixed-point parabolas. Example 1 (Fuzhou City's 10th problem in 2015) Known a function image goes through (1, -4), (2 , - 2) two points, in a certain range of the value of the argument x, there is a function value y decreases with the increase of x, then the function that meets the above conditions may be