28 乘法 21 等于多少？

28 × 20 = 560 28 × 22 = 616 28 × 19 = 532 28 × 23 = 644 28 × 24 = 672 28 × 18 = 504 28 × 25 = 700 28 × 17 = 476 29 × 21 = 609 27 × 21 = 567 30 × 21 = 630 26 × 21 = 546 31 × 21 = 651 25 × 21 = 525 32 × 21 = 672 24 × 21 = 504 6 × 98 = 588 7 × 84 = 588 12 × 49 = 588 14 × 42 = 588 21 × 28 = 588 42 × 14 = 588 71 × 2 = 142 55 × 85 = 4675 36 × 82 = 2952 92 × 23 = 2116 27 × 44 = 1188 17 × 48 = 816 27 × 15 = 405 51 × 5 = 255