所以 2Tn? 1?22?3?23???(2n?5)?2n-1+(2n?3)?2n?(2n?1)?2n?1 ② 由①-②得 ?Tn?2?2?2???2?化简得 Tn?(2n?3)?2n?134n?1n?1(n2??1)2 , ?6. 1Tn?6(2n?3?)n?2n2?31211??因为 =, ???n?2Tn?1?6(2n?1?)2n?424n?222n?1T?6(1)当n为奇数时,(?1)??1?n, Tn?1?6T?631所以 ???1...
发布日期:2018-10-09 14:50:48