数学学习离不开解题探究,其中探究的主要方面就是问题的一般形式。探究过程中的很多细小环节看似平淡,却充满智慧,只有静下心去,认真研究,方能洞晓其中的奥秘。本文以一道抛物线考题为例进行说明。例1(2015年高考数学四川卷理科第10题)设直线l与抛物线y~2=4x相交于A、B两点,与圆(x-5)~2+y~2=r~2(r>0)相切于点M,且M为线段AB的 Mathematical learning is inseparable from the exploration of the problem, in which the main aspects of inquiry are the general form of the problem. Many small steps in the process of inquiry seem placid, but full of wisdom, only to stop and carefully study, can only know the mystery. In this paper, a parabolic test questions as an example to illustrate. Example 1 (2015 college entrance examination mathematics Sichuan Section 10) set the line l and parabola y ~ 2 = 4x intersect at A, B two points, and the circle (x-5) ~ 2 + y ~ 2 = r ~ 2 r> 0) is tangent to point M, and M is the segment AB