导数,极限,

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导数,极限,
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导数,极限,
导数,极限,

导数,极限,
[f(4t-3)-f(t-3)]/(5t) = [f(4t-3)-f(-3)]/(5t) - [f(t-3)-f(-3)]/(5t)
= (4/5)[f(-3+4t)-f(-3)]/(4t) - (1/5)[f(-3+t)-f(-3)]/t
-> (4/5)f'(-3) - (1/5)f'(-3)
= 4/5 - 1/5
= 3/5
答案:C.3/5