如果y=logax在x∈[2,+∞)上恒有|y|>1,則a的范圍是_.
如果y=logax在x∈[2,+∞)上恒有|y|>1,則a的范圍是______.
數(shù)學(xué)人氣:144 ℃時(shí)間:2019-11-14 14:03:16
優(yōu)質(zhì)解答
①當(dāng)a>1時(shí),y=logax為單獨(dú)增函數(shù),∵x∈[2,+∞)∴y>0,∴|y|=y>1即loga2>1=logaa,∴a<2∴1<a<2②當(dāng)0<a<1時(shí),y=logax為單獨(dú)減函數(shù),∵x∈[2,+∞)∴y<0∴|y|=-y>1即-loga2>1=logaa∴l(xiāng)oga12>logaa∴1...
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