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一元二次方程在初中数学教学中应用非常广泛,牵涉的知识点较多,也是各地中考考题中重点考查的一个知识点.然而在解题过程中,学生常会因为概念不清、考虑不周而出现忽视二次项系数不为0、对未知数及其系数的取值范围考虑不周、忽视一元二次方程根的判别式、忽视实际问题中检验方程解的合理性等问题.因此,笔者就一元二次方程中常见的错误解法进行分析,以求提高学生的解题能力.一、忽视二次项系数不能为0
Unary quadratic equations in the junior high school mathematics teaching is widely used, involving more knowledge points, but also around the examination questions in the focus of a knowledge test point.However, in the process of solving problems, students often because of the concept of unclear, ill-considered The neglect of the coefficient of the quadratic term is not 0, the range of the unknowns and their coefficients is not considered well, the discriminant of the quadratic equation root is neglected, and the rationality of the solution of the test equation in the actual problem is neglected. Unary quadratic equation common error solution analysis, in order to improve students’ ability to solve problems.One, ignore the quadratic coefficient can not be 0