20 乘法 21 等于多少？

20 × 20 = 400 20 × 22 = 440 20 × 19 = 380 20 × 23 = 460 20 × 24 = 480 20 × 18 = 360 20 × 25 = 500 20 × 17 = 340 19 × 21 = 399 21 × 21 = 441 22 × 21 = 462 18 × 21 = 378 23 × 21 = 483 17 × 21 = 357 24 × 21 = 504 16 × 21 = 336 5 × 84 = 420 6 × 70 = 420 7 × 60 = 420 10 × 42 = 420 12 × 35 = 420 14 × 30 = 420 9 × 85 = 765 62 × 54 = 3348 65 × 93 = 6045 88 × 63 = 5544 18 × 17 = 306 51 × 59 = 3009 5 × 51 = 255 77 × 5 = 385