2 x 15 5 =( 2 x 15 3 July 8, 2019 16 32 64 128 2 x 15 mũ 5 2 x 15 mũ 3 2 x 5 )- 2 x 4 )=- 6 15 (- 3 2 x 2 5 2 5 x 15
