推 kkman162 :感恩喔~ 02/13 23:50
→ sm008150204 :突然發現我寫的第一行根本沒用到ＸＤ 02/14 00:28
f(0) = f(0+0) = f(0) + f(0) , so f(0) = 0
2 2
f(x+h) - f(x) f(x) + f(h) + 3 x h + x h - f(x)
f'(x) = lim -------------- = lim ---------------------------------
h→0 h h→0 h
f(h) 2 2
= lim ---- + 3 x + x h = 1 + 3 x
h→0 h
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