limit as x approaches-infinity of 4/x-12

解答

x \to - \infty lim (\frac{4}{x} - 12)

- 12

求解步骤

x \to - \infty lim (\frac{4}{x} - 12)

x \to a lim [f (x) \pm g (x)] = x \to a lim f (x) \pm x \to a lim g (x)

不定型除外

= x \to - \infty lim (\frac{4}{x}) - x \to - \infty lim (12)

x \to - \infty lim (\frac{4}{x}) = 0

x \to - \infty lim (12) = 12

= 0 - 12

化简

= - 12

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