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Chứng minh A=$3^{2^{4n+1}}$+$2^{3^{4n+1}}$+5$\vdots$22
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Tìm ( x;y),biết: 2xy=3(x+y)
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Tìm $\overline{abcd}$ mà $\overline{abcd}$ =$\overline{ab}$.$\overline{cd}$