80 乘法 81 等于多少？

80 × 80 = 6400 80 × 82 = 6560 80 × 83 = 6640 80 × 79 = 6320 80 × 84 = 6720 80 × 78 = 6240 80 × 85 = 6800 80 × 77 = 6160 79 × 81 = 6399 81 × 81 = 6561 78 × 81 = 6318 82 × 81 = 6642 83 × 81 = 6723 77 × 81 = 6237 84 × 81 = 6804 76 × 81 = 6156 72 × 90 = 6480 81 × 80 = 6480 90 × 72 = 6480 51 × 19 = 969 64 × 12 = 768 68 × 56 = 3808 93 × 8 = 744 18 × 80 = 1440 45 × 12 = 540 18 × 30 = 540 4 × 33 = 132 54 × 71 = 3834 12 × 93 = 1116 88 × 93 = 8184