80 乘法 21 等于多少？

80 × 20 = 1600 80 × 22 = 1760 80 × 19 = 1520 80 × 23 = 1840 80 × 24 = 1920 80 × 18 = 1440 80 × 25 = 2000 80 × 17 = 1360 79 × 21 = 1659 81 × 21 = 1701 78 × 21 = 1638 82 × 21 = 1722 83 × 21 = 1743 77 × 21 = 1617 84 × 21 = 1764 76 × 21 = 1596 20 × 84 = 1680 21 × 80 = 1680 24 × 70 = 1680 28 × 60 = 1680 30 × 56 = 1680 35 × 48 = 1680 57 × 89 = 5073 9 × 71 = 639 25 × 40 = 1000 73 × 55 = 4015 24 × 46 = 1104 41 × 32 = 1312 75 × 14 = 1050 68 × 52 = 3536