Mathematics
Senior High
๐๐ผ๐๐ผ๐๐ผ
ๆฐๅญฆ็ๅธฐ็ดๆณใฎ็บๆณใฏๆตฎใใใ ใใงใใใฉใไปใฎๆนๆณใงใใใใจ่ใใๆใซๅ็ใฎใใใชๆฐๅใๅฉ็จใใ่งฃๆณใ้ ญใซๆตฎใใณใพใใใๅฎ้ใซ่จ็ฎใใฆใฟใใจใใใ็ญใใๅบใพใใใงใใใๆฐๅใไฝฟใฃใฆใฏใใฎๅ้กใฏ่งฃใใชใใฎใงใใใใใใ้ฃๅใงใใญใ
4.6
10/
0<a<1(k=1, 2, โฆ, n) ใฎใจใ, ไธ็ญๅผ
aiQ2โฆan>ai+az+โฆ+an+1-n(n=2, 3, 4, โฆ)
ใๆใ็ซใคใใจใ็คบใใ
(ใ่ถใฎๆฐดๅฅณๅญๅคง)
akใๆๅฉใจใฟใชใใฆ่ใใพใใ
ไธ่ฌ้
ใฏ
antl-
1th
An (170) ๅ่ ใซ1
dใaใใ1 ใใฎใง
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