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“Δ=b2-4ac”是用于判断一元二次方程有无实根的一个关系式,在初中数学中它不仅应用于解决代数问题,而且在解决几何问题中,往往也会有意想不到的效果.现举例如
“Δ = b2-4ac ” is a relational equation used to determine whether a quadratic equation has real roots. In junior high school mathematics, it is not only used to solve algebraic problems, but also tends to be unexpected in solving geometric problems For example