limit as x approaches infinity of 1/(3x)

解答

x \to \infty lim (\frac{1}{3 x})

0

求解步骤

x \to \infty lim (\frac{1}{3 x})

x \to a lim [c \cdot f (x)] = c \cdot x \to a lim f (x)

= \frac{1}{3} \cdot x \to \infty lim (\frac{1}{x})

x \to a lim [\frac{f ( x )}{g ( x )}] = \frac{lim _{x \to a} f ( x )}{lim _{x \to a} g ( x )}, x \to a lim g (x) \neq = 0

不定型除外

= \frac{1}{3} \cdot \frac{lim _{x \to \infty} ( 1 )}{lim _{x \to \infty} ( x )}

x \to \infty lim (1) = 1

x \to \infty lim (x) = \infty

= \frac{1}{3} \cdot \frac{1}{\infty}

化简

\frac{1}{3} \cdot \frac{1}{\infty} : 0

= 0

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