20 乘法 81 等于多少？

20 × 80 = 1600 20 × 82 = 1640 20 × 83 = 1660 20 × 79 = 1580 20 × 84 = 1680 20 × 78 = 1560 20 × 85 = 1700 20 × 77 = 1540 19 × 81 = 1539 21 × 81 = 1701 22 × 81 = 1782 18 × 81 = 1458 23 × 81 = 1863 17 × 81 = 1377 24 × 81 = 1944 16 × 81 = 1296 18 × 90 = 1620 27 × 60 = 1620 30 × 54 = 1620 36 × 45 = 1620 45 × 36 = 1620 54 × 30 = 1620 9 × 15 = 135 44 × 67 = 2948 34 × 15 = 510 7 × 47 = 329 23 × 76 = 1748 62 × 37 = 2294 46 × 30 = 1380 85 × 85 = 7225