Processing math: 100%

333×334

3×4=12334=1122333×334=1112223333×3334=11112222,左列存在規律,是否可以因此推論

333333n3×333334(n1)3=111111n1222222n2

顯然,當n是自然數,則 10n19 = 111111n1

333333n3 = n99999993 = 10n13

333334(n1)3 = n99999993+1 = 10n+23

 

333333n3 × 333334(n1)3 = 10n13 × 10n+23= 102n+10n29 = (102n1)+(10n1)9=

(102n1)9+(10n1)9 =1111112n1+111111n1 = 111111n1222222n2

 


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