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一元二次方程是初中数学的重要内容之一 ,以一元二次方程知识为背景的问题是历年中考的热门试题 .这里与同学们交流一下如何恰当地构造一元二次方程 ,利用根与系数的关系或判别式解题 .一、解不等式问题例 1 已知一元二次方程 2x2 -2x + 3m-1 =0有两个实数根x1 、x2 ,且它们满
One-member quadratic equation is one of the important contents of junior high school mathematics. The problem of using one-dimensional quadratic equation knowledge is a hot topic in the annual examination. It is here to communicate with the students how to properly construct a unitary quadratic equation, using the root and coefficient. Relational or discriminant problem solving. First, solution inequality problems Example 1 It is known that the unary quadratic equation 2x2 -2x + 3m-1 =0 has two real roots x1, x2, and they are full