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本文例析含有式子|x+a|+|x+b|一类问题的解题途径. 途径一对|x+a|+|x+b|分类讨论,去绝对值可理解为分段函数. 途径二从几何意义来看|x+a|+|x+ b|可理解为数轴上动点P(x)到定点A(-a), B(-b)的距离之和.
This article illustrates the problem-solving approach for a class of problems such as |x+a|+|x+b|. A pair of methods |x+a|+|x+b| discusses the classification. Absolute value can be understood as segmentation. Function. From the geometrical point of view, the path x |a++|x+ b| can be understood as the sum of the distance from the point P(x) to the point A(-a) and B(-b) on the axis.