已知f′(5)=−4f'(5) = - 4f′(5)=−4,则极限limh→0f(5)−f(5+h)2h=\lim\limits_{h \to 0}\dfrac{f(5) - f(5 + h)}{2h} =h→0lim2hf(5)−f(5+h)=( ).
(A)000
(B)222
(C)−2-2−2
(D)−4-4−4
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