99 乘法 80 等于多少？

99 × 79 = 7821 99 × 81 = 8019 99 × 78 = 7722 99 × 82 = 8118 99 × 83 = 8217 99 × 77 = 7623 99 × 84 = 8316 99 × 76 = 7524 98 × 80 = 7840 100 × 80 = 8000 97 × 80 = 7760 96 × 80 = 7680 95 × 80 = 7600 94 × 80 = 7520 93 × 80 = 7440 92 × 80 = 7360 80 × 99 = 7920 88 × 90 = 7920 90 × 88 = 7920 14 × 17 = 238 66 × 69 = 4554 13 × 97 = 1261 20 × 42 = 840 82 × 17 = 1394 28 × 88 = 2464 21 × 10 = 210 89 × 89 = 7921 21 × 76 = 1596 76 × 17 = 1292 82 × 21 = 1722