“零”看似简单,但在初中数学中占有举足轻重的地位.初中数学中的有些定义、定理、性质等都有一定的限制条件,同学们在做题时往往需要自己去挖掘题中的隐含条件,才能正确解答.因而许多命题专家总是精心设置“零”陷阱,从而构成了中考和竞赛中的一类考查基本概念和辨析能力的好题.解题时有不少学生由 “Zero ” seemingly simple, but plays a decisive role in the mathematics of junior high school.Some definitions, theorems and properties of junior high school mathematics have certain restrictions, students often need to dig their own questions So many propositional experts always elaborately set the “zero” trap, thus constituting a class exam and competition in the basic concepts and ability to analyze the good question. Student by