∵a-x是減函數(shù)
要使y= loga (a-x)是減函數(shù)
則必須a>1
又a-x>0在[1,2]恒成立【真數(shù)大于0】
∴a-2>0
a>2
綜上,a>2
若函數(shù)y=log(a) (a-x)(a>0,且a≠1)在區(qū)間[1,2]上是減函數(shù),則a的取值范圍是
若函數(shù)y=log(a) (a-x)(a>0,且a≠1)在區(qū)間[1,2]上是減函數(shù),則a的取值范圍是
數(shù)學(xué)人氣:252 ℃時間:2020-04-16 21:15:58
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