Giải hệ : $\left\{ \begin{array}{l} {\log _6}\left( {\sqrt x + \sqrt[4]{x}} \right) = \frac{1}{4}{\log _2}x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)\\ \frac{{\sin \,\frac{{16\pi }}{x}}}{{cos\,\frac{{x\pi }}{{16}}}} < 1 - cos\,\frac{{\sqrt x \pi }}{4}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(2) \end{array} \right.$
Đăng bài 08-05-12 04:03 PM
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Giải hệ : $\left\{ \begin{array}{l} \log _2^2x - {\log _2}{x^2} < 0\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)\\ \frac{{{x^3}}}{3} - 3{x^2} + 5x + 9 > 0\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(2) \end{array} \right.$
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