21 乘法 4 等于多少？

21 × 3 = 63 21 × 5 = 105 21 × 2 = 42 21 × 6 = 126 21 × 1 = 21 21 × 7 = 147 21 × 8 = 168 21 × 9 = 189 20 × 4 = 80 22 × 4 = 88 19 × 4 = 76 23 × 4 = 92 24 × 4 = 96 18 × 4 = 72 25 × 4 = 100 17 × 4 = 68 1 × 84 = 84 2 × 42 = 84 3 × 28 = 84 4 × 21 = 84 6 × 14 = 84 7 × 12 = 84 51 × 41 = 2091 15 × 97 = 1455 66 × 97 = 6402 57 × 79 = 4503 9 × 80 = 720 12 × 2 = 24 17 + 67 = 84 99 - 15 = 84