A.a(x)與β(x)是等價無窮小 B.a(x)與β(x)是高價無窮小 C.a(x)是β(x)的低階無窮小 D.a(x)與β(x)是同階無窮小但不是等價無窮小
A.f′(x)>0,f″(x)<0 B.f′(x)<0,f″(x)>0 C.f′(x)>0,f″(x)>0 D.f′(x)<0,f″(x)<0
(2013)函數(shù)的極值可疑點(diǎn)的個數(shù)是:()
A.0 B.1 C.2 D.3