5. (20 points) Let different letters represent different non-zero digits, and the same letters represent the same digits. If $\overline{\mathrm{AB}} \times \overline{\mathrm{CB}}=$ $\overline{\mathrm{DDD}}$, and $\overline{\mathrm{AB}}<\overline{\mathrm{CB}}$, find $A, B, C, D$.