3.1x9 4.21x9 5.321
2.1×9= ()×9 3.21×9= ()×9= 4.321×9= .
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相关问题
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例:2.1×9=18.9;3.21×9=28.89;4.321×9=38.889;5.4321×9=48.8889.求6
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观察下列各式:①9×0+1=1;②9×1+2=11;③9×2+3=21;④______;⑤9×4+5=41;….
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(21.2×6.9+21.2×3+6.9×3)×2=?
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9×0+1=1 9×1+2=11 9×2+3=21.9 9×3+4=31 9×4+5=41…… 猜想第n个等式(n为正整
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观察下面一组算式后再写右边的数字.21×9=189 54321×9= 321×9=2889 654321×9=?
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1.(1.3×3.9×11.7+3×9×27+1/17×3/17×9/17)/(1.3×2.6×3.9+3×6×9+1/
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1×9=912×9=108123×9=11071234×9=1110612345×9=______123456×9=__
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11×9+1=22×9+2=33×9+3=____________ 4×8=404×8=40404×8=________
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[4/1×5]+[4/5×9]+[4/9×13]+[4/13×17]+[4/17×21]= ___ .
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算一算.7×2-2= 4×9+9= 3×8-3= 3×6+3= 7×4+4= 4×9-9= 5×8+8= 6×3-6=