81 乘法 80 等于多少？

81 × 79 = 6399 81 × 81 = 6561 81 × 78 = 6318 81 × 82 = 6642 81 × 83 = 6723 81 × 77 = 6237 81 × 84 = 6804 81 × 76 = 6156 80 × 80 = 6400 82 × 80 = 6560 83 × 80 = 6640 79 × 80 = 6320 84 × 80 = 6720 78 × 80 = 6240 85 × 80 = 6800 77 × 80 = 6160 72 × 90 = 6480 80 × 81 = 6480 90 × 72 = 6480 92 × 90 = 8280 96 × 34 = 3264 66 × 12 = 792 79 × 21 = 1659 30 × 99 = 2970 92 × 38 = 3496 29 × 54 = 1566 15 × 77 = 1155 79 × 25 = 1975 33 × 26 = 858 66 × 92 = 6072