解答一元二次方程问题,初学者的错误主要出现在含有字母系数的一元二次方程这类题目中。所以,历年来各地的中考试卷常常在此设置“陷阱”。为此,本文提出几点注意事项。 1.如果题目中指明是二次方程或有两个实数根,应注意二次项系数不能为零 例1 a为何值时,方程a~2x~2+(2a-1)x+1=0有两个实数根。 To solve the problem of one-quadratic quadratic equations, the errors of beginners mainly appear in such problems as the quadratic equation with letter coefficients. Therefore, the middle school exams around the country often set “traps” here. For this reason, this article proposes several points for attention. 1. If the title indicates a quadratic equation or has two real roots, it should be noted that the coefficient of the quadratic term cannot be zero. Example 1 a When the value is, the equation a~2x~2+(2a-1)x+1=0 There are two real roots.