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求与一元二次方程的根有关的代数式的值的问题是各类考试中常出现的问题.这类问题往往需要灵活运用根的定义来解,可能达到非常简捷的效果.下面举几例说明.
The problem of finding algebraic formulas related to the roots of a one-dimensional quadratic equation is a problem that often arises in various examinations. Such problems often need to be flexibly applied to the root definition, and may achieve very simple results. Here are some examples.