4 乘法 20 等于多少？

4 × 19 = 76 4 × 21 = 84 4 × 22 = 88 4 × 18 = 72 4 × 23 = 92 4 × 17 = 68 4 × 24 = 96 4 × 16 = 64 3 × 20 = 60 5 × 20 = 100 2 × 20 = 40 6 × 20 = 120 1 × 20 = 20 7 × 20 = 140 8 × 20 = 160 9 × 20 = 180 1 × 80 = 80 2 × 40 = 80 5 × 16 = 80 8 × 10 = 80 10 × 8 = 80 16 × 5 = 80 31 × 57 = 1767 67 × 42 = 2814 81 × 4 = 324 55 × 73 = 4015 82 × 78 = 6396 16 × 62 = 992 31 + 49 = 80 59 + 21 = 80