exo7 623

Déterminer les limites suivantes, en justifiant vos calculs.

1

lim⁡x→0+x+2x2ln⁡x\displaystyle\lim_{x \rightarrow0^+}{x+2 \over x^2 \ln x}

2

lim⁡x→0+2xln⁡(x+x)\displaystyle\lim_{x \rightarrow0^+}2x \ln(x+\sqrt x)

3

lim⁡x→+∞x3−2x2+3xln⁡x\displaystyle\lim_{x \rightarrow+ \infty}{x^3-2x^2+3 \over x \ln x}

4

lim⁡x→+∞ex+1x+2\displaystyle\lim_{x \rightarrow+ \infty}{e^{\sqrt x+1} \over x+2}

5

lim⁡x→0+ln⁡(3x+1)2x\displaystyle\lim_{x \rightarrow0^+}{\ln(3x+1) \over2x}

6

lim⁡x→0+xx−1ln⁡(x+1)\displaystyle\lim_{x \rightarrow0^+}{x^x-1 \over\ln(x+1)}

7

lim⁡x→−∞2x+1ln⁡(x3+41−x2)\displaystyle\lim_{x \rightarrow- \infty}{2 \over x+1}\ln \Bigl({x^3+4 \over1-x^2}\Bigr)

8

lim⁡x→(−1)+(x2−1)ln⁡(7x3+4x2+3)\displaystyle\lim_{x \rightarrow{(-1)}^+}(x^2-1) \ln(7x^3+4x^2+3)

9

lim⁡x→2+(x−2)2ln⁡(x3−8)\displaystyle\lim_{x \rightarrow2^+}{(x-2)}^2 \ln(x^3-8)

10

lim⁡x→0+x(xx−1)ln⁡(x+1)\displaystyle\lim_{x \rightarrow0^+}{x(x^x-1) \over\ln(x+1)}

11

lim⁡x→+∞(xln⁡x−xln⁡(x+2))\displaystyle\lim_{x \rightarrow+ \infty}(x \ln x -x \ln(x+2))

12

lim⁡x→+∞ex−ex2x2−x\displaystyle\lim_{x \rightarrow+ \infty}{e^x-e^{x^2} \over x^2-x}

13

lim⁡x→0+(1+x)ln⁡x\displaystyle\lim_{x \rightarrow0^+}{{(1+x)}^{\ln x}}

14

lim⁡x→+∞(x+1x−3)x\displaystyle\lim_{x \rightarrow+ \infty}{\Bigl({x+1 \over x-3}\Bigr)^x}

15

lim⁡x→+∞(x3+5x2+2)x+1x2+1\displaystyle\lim_{x \rightarrow+ \infty}{\Bigl({x^3+5 \over x^2+2}\Bigr)^{x+1 \over x^2+1}}

16

lim⁡x→+∞(ex+1x+2)1x+1\displaystyle\lim_{x \rightarrow+ \infty}{\Bigl({e^x+1 \over x+2}\Bigr)^{1 \over x+1}}

17

lim⁡x→0+(ln⁡(1+x))1ln⁡x\displaystyle\lim_{x \rightarrow0^+}\bigl(\ln(1+x)\bigr)^{1\over\ln x}

18

lim⁡x→+∞x(xx−1)x(xx)\displaystyle\lim_{x \rightarrow+ \infty}{x^{(x^{x-1})} \over x^{(x^{x})}}

19

lim⁡x→+∞(x+1)xxx+1\displaystyle\lim_{x \rightarrow+ \infty}{(x+1)^x \over x^{x+1}}

20

lim⁡x→+∞xln⁡(x2+1)1+ex−3\displaystyle\lim_{x \rightarrow+ \infty}{x \sqrt{\ln(x^2+1)} \over 1+e^{x-3}}

Exercice 6EEx

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