A.αex
B.axex
C.aex+bx
D.axex+bx
A.3
B.6
C.9
D.9e
A.(-∞,1]
B.[1,2]
C.[2,+∞)
D.[1,+∞)
A.2cosx
B.cos2x
C.2cos2x
D.cosx
A.x2/2
B.2x2
C.1
D.C(任意常数)
A.x2x-1dx
B.2xdx
C.(2x/ln2)dx
D.2xln2dx
A.2x
B.x3
C.(1/3)x3+C
D.3x3+C
A.单调减少
B.单调增加
C.为常量
D.不为常量,也不单调
A.-(1/5)
B.0
C.1/5
D.5
A.-3-xln3
B.3-xlnx
C.-3-x-1
D.3-x-1
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