解析几何中的定值、定点、定直线——“三定”问题是近年来高考命题的热点,由于在解题之前我们不知道这些问题“确定”的结果,往往很难找到解题的切入口.一般考生通过盲目的探索之后,只能是望“题”兴叹,不了了之,可以说是高考解题中的一大难点.其实解题也有规律可循,下面就结 Analysis of fixed values ​​in the geometry, fixed point, set a straight line - the “three” problem is a hot topic in recent years college entrance examination, because we do not know the problem before “solution” of the results, it is often difficult to find a solution to the problem of cutting Entrance. After the general examination by blind, can only be hope “question” sigh, can not be said that the college entrance examination problem solving a major difficulty. In fact, the problem-solving law, the following knot