→ xling5216:能羅必達嗎！？＝ˇ＝ 61.223.40.13 08/04 21:03
Suppose f(x) is twice-differential. Then
f(x+h)+f(x-h)-2f(x)
lim ------------------------- = ?
h->0 2h^2
拜託大家了 謝謝!
參考書答案給 f''(x)
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2
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