2001年各地中考数学试卷中出现了以前少见的函数开放题,虽然有不少题只要求写一个答案,但是它们有着较好的复习功能,是复习巩固所学函数的性质及数形结合、待定系数法等数学思想方法的难得的好题,特举几例浅析如下 例1(济宁市)函数y=kx2+(2k+1)x+1的图象与x轴的交点的个数是____个. In 2001, there were previously uncommon function opening questions in the mathematics examination papers of various localities. Although there are many questions that require only one answer, they have a good review function. They are the nature of reviewing and consolidating the functions and the combination of numbers and shapes. The mathematics and methods of mathematics, such as the coefficient method, is a rare good question, to give a few examples. The following example 1 (Jining City) function y=kx2+(2k+1)x+1 The number of intersections of the image with the x-axis is _ ___.