12 7 x 2 3 7 5 July 8, 2019 16 32 64 128 12 7 chia x 2 3 7 5 Tìm x 12 7 x 2 3 7 5 Tìm x 12 7 chia x 2 3 7 5 7 12 x 3 2 5 7 12 x 9 2 5
