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Binh nhất
Cho k là 1 số nguyên dương $k\geq7$ và 0$\leq$x,y<$2^{k}$.Có bao nhiêu bộ số (x;y) thỏa $$73^{73^x}\equiv 9^{9^y} (mod 2^k)$$
Edited by Lyer, 15-08-2013 - 17:51.
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