10.對(duì)一切實(shí)數(shù)x.函數(shù)恒為正值.則實(shí)數(shù)a的取值范圍是 ( ) A. B. C. D. 查看更多

 

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若函數(shù)f (x)=-(a2-11a+10)x2-(a-1)x+2對(duì)一切實(shí)數(shù)x恒為正值,則實(shí)數(shù)a的取值范圍是( 。

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若函數(shù)f (x)=-(a2-11a+10)x2-(a-1)x+2對(duì)一切實(shí)數(shù)x恒為正值,則實(shí)數(shù)a的取值范圍是( 。
A.1≤a≤9B.1<a<9C.a(chǎn)≤1或a>9D.1≤a<9

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若函數(shù)f (x)=-(a2-11a+10)x2-(a-1)x+2對(duì)一切實(shí)數(shù)x恒為正值,則實(shí)數(shù)a的取值范圍是( )
A.1≤a≤9
B.1<a<9
C.a(chǎn)≤1或a>9
D.1≤a<9

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若函數(shù)f (x)=-(a2-11a+10)x2-(a-1)x+2對(duì)一切實(shí)數(shù)x恒為正值,則實(shí)數(shù)a的取值范圍是( )
A.1≤a≤9
B.1<a<9
C.a(chǎn)≤1或a>9
D.1≤a<9

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若函數(shù)f (x)=-(a2-11a+10)x2-(a-1)x+2對(duì)一切實(shí)數(shù)x恒為正值,則實(shí)數(shù)a的取值范圍是


  1. A.
    1≤a≤9
  2. B.
    1<a<9
  3. C.
    a≤1或a>9
  4. D.
    1≤a<9

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