3x 3 2 5x 10 3 1 July 8, 2019 16 32 64 128 3x 3 12x 2 10 5x 3 4x 2 x 5 2 5x 3 18 3x 3 10 3x 3 2 5x 10 phần 3 1 3 x-5=x+3
