21 乘法 2 等于多少？

21 × 1 = 21 21 × 3 = 63 21 × 4 = 84 21 × 5 = 105 21 × 6 = 126 21 × 7 = 147 21 × 8 = 168 21 × 9 = 189 20 × 2 = 40 22 × 2 = 44 19 × 2 = 38 23 × 2 = 46 24 × 2 = 48 18 × 2 = 36 25 × 2 = 50 17 × 2 = 34 1 × 42 = 42 2 × 21 = 42 3 × 14 = 42 6 × 7 = 42 7 × 6 = 42 14 × 3 = 42 39 × 60 = 2340 74 × 73 = 5402 56 × 74 = 4144 39 × 72 = 2808 68 × 57 = 3876 13 × 74 = 962 74 - 32 = 42 37 + 5 = 42