有关求最小距离的实际问题在高考应用题中经常出现,这类问题常用解法有基本不等式、二次函数关系等,其中有几类最小距离问题可以采用一些灵活的特殊解法,使计算更加的便捷。1利用圆锥曲线定义例1如图1,P是双曲线x~2/9-y~2/16=1的右支上一点,M是圆(x+5)~2+y~2=4上一点,点N坐 The practical problems of seeking the minimum distance often appear in the college entrance examination application questions. The common solutions to such problems are basic inequalities, quadratic function relations, etc. There are several types of minimum distance problems that can adopt some flexible special solutions to make the calculation more convenient . 1 Conic Curve Definition Example 1 As shown in Figure 1, P is the upper right branch of the hyperbola x ~ 2/9-y ~ 2/16 = 1, and M is a circle from (x + 5) ~ 2 + y ~ 2 = 4 On the point, point N sit