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三角形两边之和大于第三边,两边之差小于第三边.这条性质在解题中有着广泛的应用,下面举例加以说明.一、判断三点是否共线
The sum of the two sides of the triangle is greater than the third side, and the difference between the two sides is smaller than that of the third side. This property has a wide range of applications in problem solving.