一道大一的微积分题目Considerthefunctionf-查字典问答网
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  一道大一的微积分题目Considerthefunctionf(x)=xx;x>0.(a)Findf0(x)andf00(x).(b)Solvef0(a)=0.Isthereanyb>0suchthatf00(b)=(c)Itisclearthatf0(x)<0forx<aandf0(x)>0forx>a.Thereforefisdecreasingon(0;

  一道大一的微积分题目

  Considerthefunctionf(x)=xx;x>0.

  (a)Findf0(x)andf00(x).

  (b)Solvef0(a)=0.Isthereanyb>0suchthatf00(b)=

  (c)Itisclearthatf0(x)a.Thereforefisdecreasingon

  (0;a)andincreasingon(a;1)andsofisnot1􀀀1.Letg(x)=xx;x>a.Explainwhyg

  is1􀀀1.

  (d)Find(g􀀀1)0(4).

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2020-03-1319:51
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方景文

  (1)f'(x)=2x.f"(x)=2

  (2)f"(x)=2为常数,不存在f"(b)=0

  (3)f(x)=xx=0,x=0.a=0

2020-03-13 19:54:02
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