8 乘法 81 等于多少？

8 × 80 = 640 8 × 82 = 656 8 × 83 = 664 8 × 79 = 632 8 × 84 = 672 8 × 78 = 624 8 × 85 = 680 8 × 77 = 616 7 × 81 = 567 9 × 81 = 729 6 × 81 = 486 10 × 81 = 810 11 × 81 = 891 5 × 81 = 405 12 × 81 = 972 4 × 81 = 324 9 × 72 = 648 12 × 54 = 648 18 × 36 = 648 24 × 27 = 648 27 × 24 = 648 36 × 18 = 648 84 × 28 = 2352 75 × 12 = 900 15 × 66 = 990 21 × 10 = 210 47 × 33 = 1551 37 × 17 = 629 28 × 63 = 1764 51 × 61 = 3111