临近中考,使复习更有效,是我们一线教师的追求,更注重学生数学思维的培养和解决问题能力的培养。更深挖掘例题的功能,也是对我们教师提出的更高的要求。下面以课堂教学的某些片段为例,谈谈对复习有效性的探究。例题:已知对称轴平行于y轴的抛物线经过点B(0,1),顶点是A(2,0)。(1)求这条抛物线的解析式(;2)在抛物线上是否存在 Proximity to the senior high school entrance examination, so that the review is more effective, is our pursuit of front-line teachers, pay more attention to students’ mathematical thinking and problem solving ability training. Further digging the features of the examples is also a higher demand for our teachers. The following section of the classroom teaching as an example, to talk about the validity of the review. Example: It is known that a parabola whose axis of symmetry is parallel to the y-axis passes through point B (0,1) and its vertex is A (2,0). (1) Find the parabola’s analytical expression (; 2) on the parabola