一元二次方程是初中数学的重要内容,是中考的重点.由于概念不清、考虑不周,解题时常会出现一些错误.现将常见错误归类剖析如下,希望你能从中吸取教训,不再犯类似错误.一、忽视方程化为一般形式例1(2011年泰安卷)解方程2x2+5x=3.错解:因为a=2,b=5,c=3,Δ=52-4×2×3=1, Unary quadratic equation is an important part of junior high school mathematics, is the focus of the senior high school entrance examination due to unclear concepts, ill-considered problem-solving often appear some mistakes. Now common misclassification as follows, I hope you can learn from it, not Repeat a similar mistake .One, ignore the equation into the general form Example 1 (2011 Taian volumes) solution of the equation 2x2 +5 x = 3. Misinterpretation: because a = 2, b = 5, c = 3, Δ = 52-4 × 2 × 3 = 1,