“没有数据”的求值题在数学竞赛中经常出现,参赛生往往望而生畏,束手无策.实际上,解答这类题只要紧扣有关定义、基本概念、图形结构特征,挖掘题中的隐含条件,就可将“没有数据”的题转化为“有数据”的求值题.现举几例说明之. The question of “no data” is often found in math competitions. Entrepreneurs are often intimidated and helpless. In fact, answering such questions should be closely related to the definitions, basic concepts, characteristics of the graph structure, and the implicit conditions in mining problems. You can turn the “no data” question into an “evaluation question” with “data”. Here are a few examples.