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 式子叫做根式,這里n叫做根指數(shù),a叫做被開方數(shù).當(dāng)n為奇數(shù)時(shí),=a,當(dāng)n為偶數(shù)時(shí),=|a|. (本文共 46 字 ) [閱讀本文] >>