40 乘法 20 等于多少？

40 × 19 = 760 40 × 21 = 840 40 × 22 = 880 40 × 18 = 720 40 × 23 = 920 40 × 17 = 680 40 × 24 = 960 40 × 16 = 640 39 × 20 = 780 41 × 20 = 820 38 × 20 = 760 42 × 20 = 840 37 × 20 = 740 43 × 20 = 860 44 × 20 = 880 36 × 20 = 720 8 × 100 = 800 10 × 80 = 800 16 × 50 = 800 20 × 40 = 800 25 × 32 = 800 32 × 25 = 800 78 × 58 = 4524 63 × 83 = 5229 30 × 22 = 660 14 × 5 = 70 43 × 15 = 645 73 × 98 = 7154 18 × 42 = 756 3 × 100 = 300