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下列函数在定义域中是减函数的是A.f(x)=2xB.f(x)=x2C.D.f(x)=x3
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下列函数在定义域中是减函数的是( )
A.f(x)=2
xB.f(x)=x
2C.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAFIAAAAqCAYAAAAgXQw3AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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QW+O9BF/HuT9Fsb1AYOe4p8HuZrK5TwByURSQDKB/APpSlm5GgfsUwAAAABJRU5ErkJggg==
)
D.f(x)=x
3
相关试题
-
下列函数在定义域中是减函数的是( )
A.f(x)=2x
B.f(x)=x2
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAFIAAAAqCAYAAAAgXQw3AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAKuSURBVGhD7ZpbjoUgDIZZmXtiO26GpbgUxnJT
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2Ul3KMYfjc1BOojaAjKjld2AJEDcdhuZjt/mg30vULDvffylJwMJ8DIAAJYEMYZmrL4r+hYxqGn2
DwUFPr23Sstrc4EE5QU1JhwlWMprCOWAYvbYN58pP/Y4kKDEpJKkQFAVkkIO+Dk+G3f/P0R4KxN8
MUNaYzX4qp3gGwo6+p1lxEQ9n4w3KTLVxEuOndoYA2rAdjZeqJVYqQmb45XtNWxQcbZ5khd5HG8A
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QW+O9BF/HuT9Fsb1AYOe4p8HuZrK5TwByURSQDKB/APpSlm5GgfsUwAAAABJRU5ErkJggg==
)
D.f(x)=x3
-
下列函数是奇函数的是( )
A.y=-![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAsAAAAjCAYAAABCU/B9AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADNSURBVDhP1VRBDsQgCORl/Mnv8BmfwlOoaLWs
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H/RsqM9BkdoEvZbSMaHAGLjB1zo7fS/ALISRGsrUF+JoHLfhmOaBN24suMdsh4rOfzvgFwPbPTHl
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DAP7u0k5AHjVgq+ElpA7AAAAAElFTkSuQmCC
)
B.y=x2
C.y=x3,x∈[0,1]
D.y=1
-
下列函数是奇函数的是( )
A.y=-![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAsAAAAjCAYAAABCU/B9AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADNSURBVDhP1VRBDsQgCORl/Mnv8BmfwlOoaLWs
i3RNs8kuSRMP0xGGGUE2Cjaw8gDMJAggoF/Kb5ca5iwJSbhCyrn8MOMvMPMJbIQ5RWB7aU53bVyM
H/RsqM9BkdoEvZbSMaHAGLjB1zo7fS/ALISRGsrUF+JoHLfhmOaBN24suMdsh4rOfzvgFwPbPTHl
b7ankU5dhkKsQU0lrn6NDVazB8DXpWiUpmTM/IM5F2YEbWWtTwVrC/qgjLeiDO08SBoOkJHiroyH
DAP7u0k5AHjVgq+ElpA7AAAAAElFTkSuQmCC
)
B.y=x2
C.y=x3,x∈[0,1]
D.y=1
-
下列函数中在区间(0,+∞)上单调递增的是( )
A.y=sin
B.y=-x2
C.y=e-x
D.y=x3
-
下列函数中在区间(0,+∞)上单调递增的是( )
A.y=sin
B.y=-x2
C.y=e-x
D.y=x3
-
下列函数中,在其定义域内既是奇函数又是增函数的是( )
A.y=2x
B.y=log2
C.y=x|x|
D.y=sin
-
已知函数y=f(x)的导数函数y=f′(x)的图象(如图),则当函数y=f(x)取得极大值时,x的值是( )
![](https://img.xintiku.com/upload/6a/0f/6a0f71a910eb51d514cb1538eb802633.png)
A.x1
B.x2
C.x3
D.x4
-
如图所示的曲线是函数f(x)=x3+bx2+cx+d的大致图象,则x12+x22等于( )
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAIoAAABhCAYAAAAJBDklAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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BRtnAAAAAElFTkSuQmCC6I+B5LyY572R
)
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADNSURBVDhPrZTtEYAgCIaZjJ1Yx2UaxVEIEQU/
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cQLm7wfyAvcztm6FDKMdAAAAAElFTkSuQmCC
)
B.
x2
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAjCAYAAABLuFAHAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAD7SURBVEhL3VWJDcQgDMtk7MQ6LMMojJIWwpOU
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GuTWNQAAAABJRU5ErkJggg==
)
D.
-
判断定义域为D的可导函数f(x)是否是“上凸函数”的流程图如图所示,则下列四个函数中是“上凸函数”的是( )
![](https://img.xintiku.com/upload/3c/b4/3cb45677587e3ab4dbbd852bb452b072.png)
A.y=2
B.y=x2
C.y=2x
D.y=ln
-
给出函数f(x)的一条性质:“存在常数M,使得|f(x)|≤M|x|对于定义域中的一切实数x均成立.”则下列函数中具有这条性质的函数是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACIAAAAjCAYAAADxG9hnAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAE6SURBVFhH7ZcBDoMgDEV7Mu7EdbgMR+EoXYuA
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YjPjPrJd1h8hxQ0tB5DcZ+aXGGQm+Mge8DbJZRyWEcDtuH4eiTi5dlOkM4y8q8Amg49sS6lp69uj
a0akxBt5TQaQ7uH1Fcju5EBqNKYeebmptQkkoDMJhNJkeweGqfDyTQcQQ0pYZZOWNOYvW/VY9ZSc
QZSrpE0aBOoexR/ylD6+kiqsf4Z85JfyObX4jtsEWaDjQ4UWz4rzyzLEtQcVQLhxm9tCUAGJI+Sm
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6QNUeaLEIZ7oNQAAAABJRU5ErkJggg==
)
B.y=x2
C.y=x+1
D.y=xsin