limit as x approaches 1-of (x^3-1)/(x-1)

解答

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

3

求解步骤

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

化简

\frac{x ^{3} - 1}{x - 1} : x^{2} + x + 1

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

代入值

x = 1

= 1^{2} + 1 + 1

化简

= 3

(x - 7)^{4} y^{^{'}} + 5 (x - 7)^{3} y = x + 7

\int \frac{1}{tan ( y )} d y

y^{^{''}} - 8 y^{^{'}} + 16 y = t^{- 7} e^{4 t}

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

x \to 5 lim (\frac{x}{x - 5})