Question

como resolve letra D e F ?

Answer 1

d) resposta => 4

f ) resposta => 1/3

espero ter ajudado

Answer 2

d) Note que quando x → -∞ -1/x → 0, logo,

lim$\lim_{x \to -\infty} (3 + e^{-1/x} ) =>  \lim_{x \to -\infty} (3 + e^{0} ) => \lim_{x \to -\infty} (3 + 1) = 4$

$\lim_{x \to -\infty} \frac{3x^{3} - 5x^{2} + 2x + 1}{9x^{3} - 5x^{2} + x - 3 } => \lim_{x \to -\infty} \frac{\frac{3x^{3} }{x^{3} } - \frac{5x^{2} }{x^{3} } + \frac{2x}{x^{3} }  + \frac{1}{x^{3} }   }{\frac{9x^{3} }{x^{3}   } -\frac{5x^{2} }{x^{3} } + \frac{x}{x^{3} } -\frac{3}{x^{3} } y} =$