21 乘法 30 等于多少？

21 × 29 = 609 21 × 31 = 651 21 × 28 = 588 21 × 32 = 672 21 × 33 = 693 21 × 27 = 567 21 × 34 = 714 21 × 26 = 546 20 × 30 = 600 22 × 30 = 660 19 × 30 = 570 23 × 30 = 690 24 × 30 = 720 18 × 30 = 540 25 × 30 = 750 17 × 30 = 510 7 × 90 = 630 9 × 70 = 630 10 × 63 = 630 14 × 45 = 630 15 × 42 = 630 18 × 35 = 630 79 × 23 = 1817 25 × 44 = 1100 7 × 51 = 357 89 × 86 = 7654 39 × 100 = 3900 68 × 81 = 5508 99 × 82 = 8118 56 × 50 = 2800