中考试题中有关二次函数的许多题目,求解的思路不难,但解题时,同学们往往由于审题不清、考虑不周而错解.现就笔者在多次参与中考数学阅卷工作中发现并积累出来的同学们的常见错误剖析如下.一、对二次函数y=ax~2+bx+c(a≠0)的图象与a,b,c的符号之间的关系不清 Many questions on the quadratic function in the examination questions, the idea of ​​solving is not difficult, but the problem-solving, students are often due to unclear exam questions, ill-considered and misunderstood. The common mistakes students have accumulated are as follows: First, the relationship between the sign of the quadratic function y = ax ~ 2 + bx + c (a ≠ 0) and the sign of a, b, c is unclear