1 乘法 21 等于多少？

1 × 20 = 20 1 × 22 = 22 1 × 19 = 19 1 × 23 = 23 1 × 24 = 24 1 × 18 = 18 1 × 25 = 25 1 × 17 = 17 2 × 21 = 42 3 × 21 = 63 4 × 21 = 84 5 × 21 = 105 6 × 21 = 126 7 × 21 = 147 8 × 21 = 168 9 × 21 = 189 3 × 7 = 21 7 × 3 = 21 21 × 1 = 21 96 × 58 = 5568 29 × 55 = 1595 17 × 89 = 1513 70 × 74 = 5180 29 × 98 = 2842 89 × 36 = 3204 20 + 1 = 21 38 - 17 = 21 44 - 23 = 21 90 - 69 = 21 96 × 7 = 672