初学者解答一元二次方程问题的错误主要集中在解含有字母系数的一元二次方程这类题中．正是这个原因，历年来各地的中考命题总爱在此设置“陷阱’．为增加同学们的“免疫力”，提醒同学们注意五点：一、如果题目中指明是二次大程或有两个实数根，应注意二次项系数不能为零．例1 The error of beginners to solve the problem of the one-quadratic quadratic equation is mainly focused on the solution of a quadratic equation with letter coefficients. It is for this reason that over the years the local pro forma proposition has always set a “trap.” To increase the students’ “immunity”, the students are reminded to pay attention to five points: First, if the title indicates that it is a second time or there is For two real numbers, it should be noted that the quadratic coefficient cannot be zero. Example 1