3 x 7 - 18 0 July 8, 2019 16 32 64 128 9 x 7 * 3 x 18 0 1 /( x 3 2 7 x 3 18 0 18 1 3 0.3 x 7 2 5 1 2 7 3 x 0 18 bằng bao nhiêu 3/x = 7/18 3 7x8 3 7 x 12
