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Trouver l'ensemble \(S \) des \(x\) tels que \(\ln(x) + \ln(x + 1) = 0\).
\(S =\left \{\dfrac{-1 - \sqrt{5}}{2}, \dfrac{-1 + \sqrt{5}}{2} \right\} \)
\(S =\left \{\dfrac{-1 + \sqrt{5}}{2}\right\} \)
\(S =\left \{\dfrac{-1 - \sqrt{5}}{2}\right\} \)
\( S = \emptyset \)
Calculez les deux limites suivantes :
\(l_1 :=\displaystyle \lim_{\stackrel{x \rightarrow 0}{x > 0}} e^{1/x}\)
et
\(l_2 :=\displaystyle \lim_{\stackrel{x \rightarrow 0}{x < 0}} e^{1/x}.\)
\(l_1 = 0,\, l_2 = 0\)
\( l_1 = +\infty,\, l_2 = 0 \)
\( l_1 = 0,\, l_2 = +\infty\)
\( l_1 = +\infty,\, l_2 = -\infty \)
Trouver l'ensemble \(S \) des \(x\) tels que \(e^{2x} - 2 e^x + 1 = 0 \).
\(S = \emptyset\)
\(S = \{\ln(2)\}\)
\(S = \{\ln(2), -\ln(2)\} \)
\(S = \{0\} \)
Trouver l'ensemble \(S \) des \(x\) tels que \(\ln(5x) - \ln(x + 1) = \ln(2)\).
\(S = \{-1\}\)
\(S = \left\{\dfrac{1}{4}\right\} \)
\(S =\left \{\dfrac{1}{3}\right\} \)
\( S =\left \{\dfrac{2}{3}\right\} \)
Calculez \(\displaystyle\lim_{x\to 0}(1+x)^{1/x}\) .
\(\ln(x)\)
\(e^x\)
\(1\)
\(e\)
Trouver l'ensemble \(S \) des \(x\) tels que \(e^{e^x} = 1\).
\(S = \mathbb{R}\)
\( S = \mathbb{R}^{+} \)
\(S = \{0\}\)
\( S = \emptyset\)
Calculez \(\displaystyle\lim_{\stackrel{x \rightarrow 0}{x > 0}} x\ln(x) \).
\(1 \)
\(0\)
La limite n'existe pas.
La limite n'a pas de sens.
Trouver l'ensemble \(S \) des \(x\) tels que \( \log_{10}(3x + 7) = 2 \log_{10}(5)\).
\(S = \{1\} \)
\( S = \{6\} \)
\(S = \{18\}\)
\( S =\left \{\dfrac{25}{3}\right\} \)
Calculez \(\displaystyle\lim_{\stackrel{x \rightarrow 0}{x < 0}} x\ln(x)\) .
\(+\infty\)
Trouver l'ensemble \(S \) des \(x\) tels que \(\ln(x^2 + x - 1) = \ln(x)\).
\(S = \{1, -1\}\)
\(S = \{-1, 2\} \)
