15.函數(shù)f(x)=x+2的單調(diào)遞增區(qū)間為,則a= . 查看更多

 

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函數(shù)f(x)=cos(
x3
+φ)(0<φ<2π)
,在區(qū)間(-π,π)上單調(diào)遞增,則實數(shù)φ的取值范圍為
 

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函數(shù)f(x)=cos(
x
3
+φ)(0<φ<2π)
,在區(qū)間(-π,π)上單調(diào)遞增,則實數(shù)φ的取值范圍為______.

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函數(shù)f (x)的圖象與函數(shù)f (x) =的圖象關(guān)于直線y = x對稱,則f (2x x2)的單調(diào)遞增區(qū)間為(  )

A.[1, +∞)                  B.         C.[1, 2)                         D.(0, 1]

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函數(shù)f(x)=x3+bx2+cx+d圖象如圖,則函數(shù)y=x2bx+的單調(diào)遞增區(qū)間為

[  ]

A.(-∞,-2]

B.[,+∞)

C.[-2,3]

D.[3,+∞)

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函數(shù)f(x)=alnx+x在區(qū)間[2,3]上單調(diào)遞增,則實數(shù)a的取值范圍為

[  ]
A.

a>-3

B.

a>-2

C.

a≥-3

D.

a≥-2

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