40 乘法 21 等于多少？

40 × 20 = 800 40 × 22 = 880 40 × 19 = 760 40 × 23 = 920 40 × 24 = 960 40 × 18 = 720 40 × 25 = 1000 40 × 17 = 680 39 × 21 = 819 41 × 21 = 861 38 × 21 = 798 42 × 21 = 882 37 × 21 = 777 43 × 21 = 903 44 × 21 = 924 36 × 21 = 756 10 × 84 = 840 12 × 70 = 840 14 × 60 = 840 15 × 56 = 840 20 × 42 = 840 21 × 40 = 840 10 × 88 = 880 56 × 34 = 1904 31 × 60 = 1860 60 × 16 = 960 98 × 50 = 4900 96 × 70 = 6720 13 × 54 = 702 28 × 67 = 1876