三角形中,任意两边的和大于第三边,任意两边的差小于第三边。对于这些不等关系大家已经很熟悉,下面谈谈如何在解题中灵活地运用它们。一、判定三条线段能否构成三角形例1以下列各组线段为边,能组成三角形的是 In a triangle, the sum of any two sides is greater than the third side, and the difference between any two sides is smaller than the third side. We are already very familiar with these inequality relations. Let’s talk about how to use them flexibly in problem solving. First, determine whether the three line segments can form triangles. Example 1 Take the following groups of line segments as edges. The triangles that can be formed are: