2 5 x 12 5 x 8 July 8, 2019 16 32 64 128 2 5 x 12 5 x 8 x 0 4 2 5 x 12 5 x 8 x 0 5 Tính nhanh 2 5 x 12 5 x 8 x 0 4 3 2x 5 )/ 12 5 x 3 )/ 8 x 2 2 x 2 5 2 5 x 12 2 5 x - 8 = 12 - 2 5 2 5 x - 8 = 12 - 2 5 x