初中数学中一些定义、法则公式及定理对零都有特殊的限制条件,而在各种考试中经常用这些限制条件设置陷阱出题,来考查学生分析问题的全面性和思考问题的周密性,不少学生在解题过程中往往忽略0的陷阱,导致不必要的失分,为了防止掉入陷阱,应该找到它藏在哪儿? Some definitions, rules, formulas and theorems in junior middle school mathematics have special restrictions on zero. However, in all kinds of examinations, we often set traps for these restrictions to examine the comprehensiveness of student analysis questions and the meticulousness of thinking questions. Many students in the process of solving problems often overlooked the trap of 0, resulting in unnecessary loss, in order to prevent falling into the trap, you should find it hidden where?