20 乘法 2 等于多少？

20 × 1 = 20 20 × 3 = 60 20 × 4 = 80 20 × 5 = 100 20 × 6 = 120 20 × 7 = 140 20 × 8 = 160 20 × 9 = 180 19 × 2 = 38 21 × 2 = 42 22 × 2 = 44 18 × 2 = 36 23 × 2 = 46 17 × 2 = 34 24 × 2 = 48 16 × 2 = 32 1 × 40 = 40 2 × 20 = 40 4 × 10 = 40 5 × 8 = 40 8 × 5 = 40 10 × 4 = 40 94 × 31 = 2914 5 × 51 = 255 42 × 77 = 3234 29 × 99 = 2871 7 × 85 = 595 90 × 25 = 2250 94 - 54 = 40 23 + 17 = 40