>
数学
>
若f′(x
0
)=1,则
lim
k→0
f(
x
0
−k)−f(
x
0
)
k
等于( )
A. -1
B. 1
C. 0
D. 无法确定
人气:224 ℃ 时间:2020-06-24 11:05:22
解答
lim
k→0
f(
x
0
−k)−f(
x
0
)
k
=-
lim
k→0
f(
x
0
)−f(
x
0
−k)
k
=-f′(x
0
)=-1.
故选:A.
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