在历年的中考试题中,有许多题目难度并不大,但由于命题者有意设计“陷阱”,制造解题障碍,使得一些基础知识掌握不牢固或粗心大意的学生误入这些“陷阱”,造成解题失误,那么“陷阱”是怎样设计出来的呢?一、利用数学概念、性质、法则、定理(推论)的限制条件设计“陷阱”例1关于x In the mid-term exam questions over the years, there are many questions that are not difficult, but because propositioners intentionally design “traps” and create problem solving obstacles, students who have a weak grasp of basic knowledge or carelessness mistakenly enter these traps. Solve the problem, then the “trap” is how to design it? First, the use of mathematical concepts, properties, laws, theorems (inference) of the constraints of the design “trap” Example 1 on x