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請問原因🙏🏻

3. 等比級數: 設<a>是等比數列,首項a,公比,則 (1) a = qxrn-1; a=amxr-m,n,m為自然數。 (2) ① Sh ax(1-rm) = T-r (9₁x (r" -1) ),n為自然數且≠1。 r-1 ②當n=1時,Sn=nxaq 。 (3)設S, Sz, Sz表示等比數列(a)之首n項,首2n項及首3n項的和, 則 S, Szm - Sn,S3-S2成等比數列。 2n

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