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为什么“对数函数”不叫“幂函数”?函数的概念不允许
一般的,设A、B是非空数集,如果按照某种确定的对应关系f,使对于集合a中的任意一个数x,在集合b中有唯一确定的数f(x)和它对应,那么就称f:a到b为从集合a到集合b的一个函数。
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