calculus · worked example

Solve lim x→∞ 的 1/x

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Problem

limx1x\lim_{x \to \infty} \frac{1}{x}

Step-by-step solution

  1. xx 越來越大時,1x\frac{1}{x} 會逐漸趨近於 00

  2. 對任意 ε>0\varepsilon > 0,取 N=1/εN = 1/\varepsilon,則 x>N1/x<εx > N \Rightarrow |1/x| < \varepsilon

  3. 因此 limx1x=0\lim_{x \to \infty} \frac{1}{x} = 0

Answer

00

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