设f(x)在[a,+∞)内二阶可导,且f(a)>0,f'(a)a时,f''(x)

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设f(x)在[a,+∞)内二阶可导,且f(a)>0,f'(a)a时,f''(x)

设f(x)在[a,+∞)内二阶可导,且f(a)>0,f'(a)a时,f''(x)
设f(x)在[a,+∞)内二阶可导,且f(a)>0,f'(a)a时,f''(x)

设f(x)在[a,+∞)内二阶可导,且f(a)>0,f'(a)a时,f''(x)