limit as x approaches 1-of (x^4-1)/(x-1)

解答

x \to 1 - lim (\frac{x ^{4} - 1}{x - 1})

4

求解步骤

x \to 1 - lim (\frac{x ^{4} - 1}{x - 1})

化简

\frac{x ^{4} - 1}{x - 1} : (x^{2} + 1) (x + 1)

= x \to 1 - lim ((x^{2} + 1) (x + 1))

代入值

x = 1

= (1^{2} + 1) (1 + 1)

化简

= 4

x \to - 3 lim ((5 x - 1) (2 x + 3))

x \to 2 + lim (e^{\frac{5}{2 - x}})

x \to 0 lim (x sin (\frac{1}{x ^{3}}))

x \to - \infty lim (x e^{x} + 1)

x \to 0 lim ((a^{x} - 1)^{x})