6. 若 $f(x) = \frac{1}{x^2}$，則 $\lim_{h \to 0} \frac{f(-3+h) - f(-3)}{2h} = ?$
(A) $\frac{-1}{27}$
(B) $\frac{-1}{9}$
(C) $\frac{1}{27}$
(D) $\frac{2}{27}$

阿摩線上測驗 · 2026-09-22T11:24:17+08:00

6. 若 f(x) = 1/x^2，則 _h → 0 (f(-3+h) - f(-3))/2h = ? (A) (-1)/27 (B) (-1)/9 (C) 1/27 (D) 2/27

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6. 若 $f(x) = \frac{1}{x^2}$，則 $\lim_{h \to 0} \frac{f(-3+h) - f(-3)}{2h} = ?$(A) $\frac{-1}{27}$(B) $\frac{-1}{9}$(C) $\frac{1}{27}$(D) $\frac{2}{27}$