18 7 x 5 3 x 2 July 8, 2019 16 32 64 128 Tìm x 18 7 x 5 3 x 2 13 7 x 18 82 x 10 5 3 2 x 82 Tìm xa 18 7 x 5 3 x 2 18 x = 7 2 4 5 18 - 5 x 3 + 7 = 18 x 7 1/2 5 x 7 = 35
