Đăng bài 25-05-12 04:43 PM
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Giải và biện luận hệ phương trình sau tùy theo tham số $m$ : $\left\{ \begin{array}{l} {\log _{\frac{1}{{\sqrt 2 }}}}\left( {\frac{{1 - 5co{s^4}3x}}{2}} \right) \le 2\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)\\ \frac{{1 + \sin \,x}}{{\sin \,2x}} \le m\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(2) \end{array} \right.$
Đăng bài 27-04-12 08:21 AM
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Đăng bài 23-05-12 11:11 AM
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Giải các hệ : $\begin{array}{l} 1)\,\,\,\left\{ \begin{array}{l} {\log _x}\left( {x + 2} \right) > 2\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)\\ {\log _2}{2^{x - 1}} + {\log _2}\left( {{2^{x + 1}} + 1} \right) < {\log _2}\left( {{{7.2}^x} + 12} \right)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(2) \end{array} \right.\\ 2)\,\,\,\left\{ \begin{array}{l} {\log _{7 - x}}\left( {y - 4} \right) < 0\\ {\log _{y - 1}}\left( {3 - x} \right) < 0 \end{array} \right. \end{array}$
Đăng bài 26-04-12 04:53 PM
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Đăng bài 23-05-12 10:20 AM
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Đăng bài 19-05-12 10:16 PM
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Đăng bài 07-05-12 12:02 PM
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Đăng bài 09-06-12 01:00 AM
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Đăng bài 09-06-12 01:02 AM
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Giải hệ: $\left\{ \begin{array}{l} {2^{\left| {{x^2} - 2x - 3} \right| - {{\log }_2}3}} = {3^{ - y - 4}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)\\ 4\left| y \right| - \left| {y - 1} \right| + {\left( {y + 3} \right)^2} \le 8\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(2) \end{array} \right.$
Đăng bài 26-04-12 04:50 PM
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Đăng bài 25-04-12 04:32 PM
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Đăng bài 23-05-12 10:32 AM
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Đăng bài 08-06-12 02:48 PM
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Đăng bài 03-05-12 03:33 PM
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Đăng bài 07-05-12 11:27 AM
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