7．定義在R上的函數(shù)f ( x )對(duì)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(duì)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)

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(duì)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)

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(duì)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(duì)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(duì)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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