Đăng bài 27-04-12 02:35 PM
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Đăng bài 27-04-12 10:37 AM
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Đăng bài 27-04-12 10:24 AM
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Đăng bài 27-04-12 08:28 AM
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Đăng bài 27-04-12 08:26 AM
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Đăng bài 27-04-12 08:17 AM
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Giải phương trình :
$2co{s^2}\frac{{{x^2} + x}}{6} = {2^x} + {2^{ - x}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)$
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Giải phương trình :
$x{.2^x} = x\left( {3 - x} \right) + 2\left( {{2^x} - 1} \right)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)$
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Giải phương trình :
$8 - x{.2^x} + {2^{3 - x}} - x = 0\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)$
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Đăng bài 26-04-12 03:20 PM
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Giải phương trình :
${2^{x + 1}} - {4^x} = x - 1\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)$
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Mỗi phương trình sau đây có bao nhiêu nghiệm :
$\begin{array}{l}
1)\,\,{\left( {\frac{1}{3}} \right)^x} = 2x + 1\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,3)\,{4^x} = x - 2\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(3)\\
2)\,{3^x} = x + 5\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(2)
\end{array}$
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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 26-04-12 09:22 AM
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