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Đăng bài 02-05-12 02:12 PM
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Đăng bài 02-05-12 11:53 AM
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Đăng bài 02-05-12 11:11 AM
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Đăng bài 27-04-12 02:38 PM
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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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Đăng bài 25-04-12 03:32 PM
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Đăng bài 25-04-12 02:25 PM
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Đăng bài 25-04-12 11:21 AM
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Đăng bài 24-04-12 03:22 PM
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Giải phương trình : ${8.3^{\sqrt x + \sqrt[4]{x}}} + {9.^{\sqrt[4]{x} + 1}} = {9^{\sqrt x }}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\left( 1 \right)$
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Giải các phương trình : $\begin{array}{l} 1)\,\,{4^x} + {11^x} + {\sqrt {32} ^x} = {13^x}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)\\ 2)\,\,{9.2^{2x}} = 8\sqrt {{3^{2x + 1}}} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(2) \end{array}$
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Giải phương trình : ${x^2}{.2^{x + 1}} + {2^{\left| {x - 3} \right| + 2}} = {x^2}{.2^{\left| {x - 3} \right| + 4}} + {2^{x - 1}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)$
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Giải các phương trình :
$\begin{array}{l} 1)\,{3.2^{\sqrt{x}-1}} - {8.2^{\frac{{\sqrt {x} - 1}}{2} }}+4 = 0\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)\\
2)\,\,{81^x} - {16^x} - 2\left( {{9^x} - {4^x}} \right) + {36^x} = 0\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(2) \end{array}$
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Giải phương trình : ${\left( {2 + \sqrt 3 } \right)^{{x^2} - x + 1}} + {\left( {2 - \sqrt 3 } \right)^{{x^2} - x - 1}} = \frac{2}{{\left( {2 - \sqrt 3 } \right)}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)$
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