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 12 × 78 = 936 78 × 55 = 4290 99 × 47 = 4653 87 × 90 = 7830 45 × 76 = 3420 37 × 29 = 1073 99 × 19 = 1881 8 × 32 = 256