21 乘法 1 等于多少？

21 × 2 = 42 21 × 3 = 63 21 × 4 = 84 21 × 5 = 105 21 × 6 = 126 21 × 7 = 147 21 × 8 = 168 21 × 9 = 189 20 × 1 = 20 22 × 1 = 22 19 × 1 = 19 23 × 1 = 23 24 × 1 = 24 18 × 1 = 18 25 × 1 = 25 17 × 1 = 17 1 × 21 = 21 3 × 7 = 21 7 × 3 = 21 100 × 58 = 5800 30 × 83 = 2490 80 × 68 = 5440 6 × 95 = 570 1 × 99 = 99 2 × 51 = 102 6 + 15 = 21 52 - 31 = 21 93 - 72 = 21 26 - 5 = 21 87 × 37 = 3219