三角形的三条边有如下的关系:两边之和大于第三边,两边之差小于第三边.在各种考试中,把三角形三边关系和整数、因式分解结合起来命题屡见不鲜.解决这类问题时,要熟练掌握三角形三边的关系,要具备分类讨论和对代数式进行恒等变形的能力. The three sides of the triangle have the following relationship: the sum of the two sides is larger than the third side, and the difference between the two sides is smaller than the third side. In various examinations, it is not uncommon to combine triangular trilateral relations with integer and factorization propositions. When dealing with problems, it is necessary to be proficient in the relationship between the three sides of the triangle. It is necessary to have the ability to classify and discuss the algebraic equations.