Đăng bài 02-05-12 05:32 PM
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Đăng bài 02-05-12 02:12 PM
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Đăng bài 02-05-12 11:54 AM
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Đăng bài 02-05-12 09:51 AM
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Đăng bài 02-05-12 08:51 AM
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Đăng bài 27-04-12 01:56 PM
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Đăng bài 27-04-12 11:10 AM
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Giải hệ : $\left\{ \begin{array}{l} {\log _6}\left( {\sqrt x + \sqrt[4] x} \right) = \frac{1}{4}{\log _2}x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)\\ \frac{{\sin \,\frac{{16\pi }}{x}}+1}{{cos\,\frac{{x\pi }}{{16}}}} < 1 - cos\,\frac{{\sqrt x \pi }}{4}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(2) \end{array} \right.$
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Đăng bài 26-04-12 04:18 PM
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Đăng bài 26-04-12 03:20 PM
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Đăng bài 26-04-12 03:19 PM
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Giải các phương trình sau đây : $\begin{array}{l} 1)\,\,{3^x} + {4^x} = {5^x}\,\,\,\,\,\,\,\,(1)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,4)\,\,\,{3^x} + {4^x} + {5^x}\, = {10^x}\,\,\,\,\,\,\,\,\,\,\,\,(4)\\ 2)\,{2^x} + {3^x} = {5^x}\,\,\,\,\,\,\,\,(2)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,5)\,\,\,\log \left( {x - 4} \right) = 5 - x\,\,\,\,\,\,\,\,\,\,\,\,\,\,(5)\\ 3)\,{5^x} + {12^x} = {13^x}\,\,\,\,(3) \end{array}$
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Đăng bài 25-04-12 05:11 PM
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Đăng bài 25-04-12 03:32 PM
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