20 乘法 80 等于多少？

20 × 79 = 1580 20 × 81 = 1620 20 × 78 = 1560 20 × 82 = 1640 20 × 83 = 1660 20 × 77 = 1540 20 × 84 = 1680 20 × 76 = 1520 19 × 80 = 1520 21 × 80 = 1680 22 × 80 = 1760 18 × 80 = 1440 23 × 80 = 1840 17 × 80 = 1360 24 × 80 = 1920 16 × 80 = 1280 16 × 100 = 1600 25 × 64 = 1600 32 × 50 = 1600 40 × 40 = 1600 50 × 32 = 1600 64 × 25 = 1600 75 × 15 = 1125 42 × 67 = 2814 54 × 99 = 5346 83 × 25 = 2075 38 × 67 = 2546 83 × 16 = 1328 68 × 44 = 2992 4 × 21 = 84