7.定義在R上的函數(shù)f ( x )對任意兩個(gè)不等實(shí)數(shù)a.b.總有成立.則必有 ( ) A.函數(shù)f ( x )是奇函數(shù) B.函數(shù)f ( x )是偶函數(shù) C.函數(shù)f ( x )在R上是增函數(shù) D.函數(shù)f ( x ) 在R上是減函數(shù) 查看更多

 

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定義在R上的函數(shù)f(x)對任意兩個(gè)不等實(shí)數(shù)a、b,總成立,則必有

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A.函數(shù)f(x)是先增后減函數(shù)

B.函數(shù)f(x)是先減后增函數(shù)

Cf(x)R上是增函數(shù)

Df(x)R上是減函數(shù)

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定義在R上的函數(shù)f(x)對任意兩個(gè)不等實(shí)數(shù)a、b,總有成立,則必有

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A.函數(shù)f(x)中先增后減函數(shù)

B.函數(shù)f(x)是先減后增函數(shù)

Cf(x)R上是增函數(shù)

Df(x)R上是減函數(shù)

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定義在R上的函數(shù)f(x)對任意兩個(gè)不等實(shí)數(shù)a,b,總有>0成立,則必有

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A.函數(shù)f(x)是奇函數(shù)
B.函數(shù)f(x)是偶函數(shù)
C.函數(shù)f(x)在R上是增函數(shù)
D.函數(shù)f(x)在R上是減函數(shù)

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定義在R上的函數(shù)f(x)對任意兩個(gè)不等實(shí)數(shù)a、b,總有>0成立,則有

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A.函數(shù)f(x)是先增加后減少

B.函數(shù)f(x)是先減少后增加

C.f(x)在R上是增函數(shù)

D.f(x)在R上是減函數(shù)

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定義在R上的函數(shù)f(x)對任意兩個(gè)不相等實(shí)數(shù)a,b,總有成立,則必有

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A.f(x)在R上是增函數(shù)

B.f(x)在R上是減函數(shù)

C.函數(shù)f(x)是先增加后減少

D.函數(shù)f(x)是先減少后增加

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