20) 下列哪个坐标不是函数 $f(x) = \frac{x}{x^2+1}$ 的拐点?
(A) $(-\sqrt{3}, -\frac{\sqrt{3}}{4})$
(B) $(-1, -\frac{1}{2})$
(C) $(0, 0)$
(D) $(\sqrt{3}, \frac{\sqrt{3}}{4})$
📌 考点:Calculus (Inflection Points) · 难度:中等
📌 Topic: Calculus (Inflection Points) · Difficulty: 中等
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Subject: SC07 · Unit: Calculus · Topic: Calculus (Inflection Points) · Level: 中等.
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