Tính bằng cách thuận tiện. (0,5 điểm) (145 × 9 + 137 × 8) × (255 × 9 – 263 × 8) × (10 × 27 – 9 × 30)

(145 × 9 + 137 × 8) × (255× 9 – 263× 8) × (10×27 – 9 × 30)

= (145 × 9 + 137 × 8) × (255× 9 – 263× 8) × (270 – 270)

= (145 × 9 + 137 × 8) × (255× 9 – 263× 8) × 0

= 0