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(2)函數存在反函數的必要條件是,函數的定義域與值域是一一映射;(3)一個函數與它的反函數在相應區間上單調性一致;(4)大部分偶函數不存在反函數(唯一有反函數的偶函數是f(x)= a,x∈{0}).奇函數不一定存在反函…
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