2 4 6 2 x 210 July 8, 2019 16 32 64 128 2 4 6 8 2x 210 2 4 6 8 chấm chấm 2 x 210 2 4 6 2x 210 Tìm x 2 4 6 2x 210 2*2 is 4 2 x 2 5
