5 乘法 81 等于多少？

5 × 80 = 400 5 × 82 = 410 5 × 83 = 415 5 × 79 = 395 5 × 84 = 420 5 × 78 = 390 5 × 85 = 425 5 × 77 = 385 4 × 81 = 324 6 × 81 = 486 3 × 81 = 243 7 × 81 = 567 2 × 81 = 162 8 × 81 = 648 1 × 81 = 81 9 × 81 = 729 9 × 45 = 405 15 × 27 = 405 27 × 15 = 405 45 × 9 = 405 81 × 5 = 405 71 × 29 = 2059 25 × 19 = 475 26 × 97 = 2522 93 × 100 = 9300 88 × 75 = 6600 84 × 46 = 3864 98 × 38 = 3724 90 × 42 = 3780 71 × 96 = 6816