8x 1 3 6x 12 July 8, 2019 16 32 64 128 3 8x 1 6x 5 12x 69 8x 3 12x 2 6x 1 8x 3 12x 2 6x 1 0 8x 3 12x 6x 1 Tan 1 6x 8x 3 1 12x 2 12 − 8x 1 )= − 3 6x − 4 8x 3 12x 2 6x 1 tại x 25 5 8x 3 12x 2 6x 1 tại x 49 5 8x 3 12x 2 6x 1 tại x 5 5 8x 3 12x 2 6x 1 0 tìm x 8x 3 12x 2 6x 1 27