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初等函数有一些本质的特征,先以一个简单函数方程为例。假设函数f(x)定义在整个实轴(-∞,+∞)上,且对于任何实数x与y,恒有
Elementary functions have some essential features. Take a simple function equation as an example. Assume that the function f (x) is defined over the entire real axis (-∞, + ∞), and for any real numbers x and y, constant