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给出未知数一个确定的值,求一个结构较复杂的代数式的值,是初中数学中较为常见的问题,因给出的未知数的值往往是根式或含有字母的代数式,因此用代入法会导致运算过程极为繁杂.下面向同学们介绍几种构造一元二次方程求代数式值的方法,希望对提高同学们的思维灵活性和创造性能够有所帮助.一、借助条件等式构造方程如果题设给出的未知数的值是根式,借用这个根式及其共
Given a deterministic value of unknown and finding a more complicated algebraic value is a more common problem in maths of junior high schools. Since the given values of the unknowns are often algebraic with roots or alphanumeric characters, substitutions will lead to computations The process is extremely complicated .Next to the students introduce several methods to construct a quadratic equation and algebraic values, hoping to improve the students’ thinking flexibility and creativity can help. First, the construction of equations with conditional equations If the problem is to give The value of the unknowns is the root, borrow the root and its total