1 7 x 343 July 8, 2019 16 32 64 128 1 7 x =( 1 343 3 1 7 mũ x 1 343 mũ 3 49 * 7 x 343 1 3 7 5 x 1 343 1 7 x 3 343 x 7 1 x 7