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近年来各级各类初中数学竞赛中,经常出现一类代数式求值问题,不少试题直接求解比较困难,但若能抓住问题的特征,用根的定义变更命题,构造出一元二次方程,可使问题顺利获解.下面列举几例,供同学们参考.
In recent years, all kinds of middle school mathematics competitions at all levels often appear a class of algebraic evaluation problems, many of the questions directly solve more difficult, but if we can seize the characteristics of the problem, with the definition of root change proposition, constructed a quadratic equation , The problem can be successfully solved. Here are a few examples for the students reference.