试题与答案

关于函数的单调性,下列说法正确的是( ) A.f(x)=x2+1是增函数 B.f(x

题型:选择题

题目:

关于函数的单调性,下列说法正确的是(  )
A.f(x)=x2+1是增函数
B.f(x)=x2+1在(-∞,-5)上是减函数
C.f(x)=
1
x
在R上是减函数
D.f(x)=x2+1在(-5,+∞)上是增函数

答案:

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