[*] =a1a2…an-1+an(a1a2…an-2+an-1Dn-2) =a1a2…an-1+a1a2…an-2an+anan-1Dn-2 [*]

admin2021-11-09  22

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答案[*] =a1a2…an-1+an(a1a2…an-2+an-1Dn-2) =a1a2…an-1+a1a2…an-2an+anan-1Dn-2 [*]

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