如果對(duì)該區(qū)間任意的x1<x2,總有f(x1)>f(x2),則稱(chēng)函數(shù)y=f(x)在這個(gè)區(qū)間內(nèi)是減函數(shù)(也稱(chēng)單調(diào)減少或單調(diào)下降函數(shù)). (共 71 字) [閱讀本文] >>
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 如果對(duì)該區(qū)間任意的x1<x2,總有f(x1)>f(x2),則稱(chēng)函數(shù)y=f(x)在這個(gè)區(qū)間內(nèi)是減函數(shù)(也稱(chēng)單調(diào)減少或單調(diào)下降函數(shù)). (共 71 字) [閱讀本文] >>