Question

Решите по правилу Лопиталя.. нужно СРОЧНО, заранее спасибо

Answer 1

$\displaystyle \lim_{x\to\infty}(x+2^x)^{\frac1x}=\lim_{x\to\infty}e^{\ln(x+2^x)^{\frac1x}}=\lim_{x\to\infty}e^{\frac1x\ln(x+2^x)}=\exp\bigg(\lim_{x\to\infty}\dfrac{\ln\big(2^x(2^{-x}x+1)\big)}{x}\bigg)=\exp\Bigg(\lim_{x\to\infty}\bigg(\dfrac{\ln2^{x}}{x}+\dfrac{\ln(2^{-x}x+1)}{x}\bigg)\Bigg)=\exp\Bigg(\lim_{x\to\infty}\bigg(\dfrac{\ln2^{x}}{x}\bigg)+\lim_{x\to\infty}\bigg(\dfrac{\ln(2^{-x}x+1)}{x}\bigg)\Bigg)=$$\displaystyle =\exp\Bigg(\lim_{x\to\infty}\bigg(\dfrac{(x\ln2)'}{(x)'}\bigg)+\lim_{x\to\infty}\bigg(\dfrac{\ln(2^{-x}x+1)}{x}\bigg)\Bigg)=\exp\Bigg(\ln2+\lim_{x\to\infty}\bigg(\dfrac{\ln(2^{-x}x+1)}{x}\bigg)\Bigg)=\exp\Bigg(\ln2+\dfrac0{\infty}\Bigg)=\exp(\ln2+0)=\exp(\ln2)=e^{\ln2}=\fbox 2$