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1 .方程问题转化为函数问题一元二次方程 ｆ(ｘ) =0 ,经移项 ,可化为一端是一个二次式 ,另一端是一个一次式或常数项的形式 ,从而得到 φ(ｘ) =ψ(ｘ) .令 ｙ1 =φ(ｘ) ,ｙ2 =ψ(ｘ) ,则函数 φ(ｘ)与 ψ(ｘ)的图象的交点 ,即为ｆ(ｘ) =0的解 .判断一个方程的解的个数问题 ,可
1. The equation problem is transformed into a functional problem. The quadratic equation f(x) = 0. After the transfer term, one end is a quadratic, and the other end is a form of a one-time or constant term, so that φ(x) is obtained. ) = ψ (x). Let y1 = φ(x) and y2 = ψ(x), then the intersection of the image of function φ(x) and ψ(x) is the solution of f(x) =0. To determine the number of solutions to an equation,