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Trouvez \(x\) si \((-2)^x = -\dfrac{ 1 }{ 2 } \).
\(x = 2\)
\(x = 1\)
\( x = -1 \)
Impossible
Trouvez l'ensemble \(S\) des \( x\) tels que \(\ln\left(\dfrac{x + 3}{2}\right) = \dfrac{1}{2}(\ln(x) + \ln(3)) \).
\(S = \{3\}\)
\(S =\left \{\dfrac{3}{2}\right\}\)
\(S = \{-1 + \sqrt{3}, -1 - \sqrt{3}\}\)
\(S = \{-1 + \sqrt{3}\} \)
Trouvez \(x\) si \(5^x = 625 \).
\(x = -3\)
\(x = 4 \)
Soient \(a\) , \(b\) deux nombres réels. Parmi les propriétés suivantes, laquelle est fausse ?
\(e^{a + b} = e^ae^b\)
\(e^{ab} = (e^{a})^{b}\)
\(e^{ab} = e^ae^b\)
\(\dfrac{e^a}{e^b} = e^{a-b} \)
Trouvez \(x \) si \((-2)^x = \dfrac{ 1 }{ 8 } \).
\(x = -4\)
\( x = -3\)
\(x = -1\)
Calculez la dérivée de la fonction \(f(x)=\ln(x^2)\) .
\(\ln(2x)\)
\(\dfrac{2}{x} \)
\(\dfrac{2}{x^2}\)
\(2x\ln(x) \)
Trouvez \(x\) si \((-5)^x = \dfrac{ 1 }{ 5 } \).
\( x = -2\)
\( x = -1\)
\(x = 3\)
Trouvez l'ensemble des éléments \(x \in \mathbb{R} \) tels que \(e^{\ln(x)} = x \).
\(\mathbb{R} \)
\(\mathbb{R}_{0}^{+}\)
\(\mathbb{R}^{+}\)
\(\emptyset \)
Calculez la dérivée de la fonction \(f(x)=e^{\mbox{tg}(x)} \).
\(e^{\mbox{tg}(x)}\)
\(\dfrac{e^{\mbox{tg}(x)}}{\cos^2(x)}\)
\(\dfrac{e^{\mbox{tg}(x)}}{\sin^2(x)}\)
\(e^{\cos^2(x)} \)
Trouvez l'ensemble \(S\) des \(x\) tels que \(\log_{\frac{1}{4}}(x) > -3\) .
\(S = \{64\} \)
\(S = ]-64, +\infty[ \)
\(S = ]-\infty, 64[ \)
\(S = ]0,64[\)
