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

\frac{\partial}{\partial y} (3 x + 2 y sin (x))

x \to 20 lim (sin (70 - x))

f (x) = (2 x^{4} - 1) (5 x^{3} + 6 x)

d er i v a t i v e \frac{( x ^{2} - 5 ) ^{3}}{x ^{2} + 2}

x \to 5 lim (ln (x^{2} - 25))