5 x 6 x 12 6 x 12 x 7 July 8, 2019 16 32 64 128 Tính 5 x 6 x 12 6 x 12 x 7 5 x 7 = 35 5 6 - x = 12 9 5 x 5 x 5 x 5 x 5 (12 5-x) 5=(3 6+x) 6
