Mathematics
Senior High
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(1)(2)ใงใ๐ฆ
่งฃ่ชฌ่ฆใฆใๅใใใชใใฃใใฎใงใ่งฃ่ชฌใ้กใใใพใใ
*77 ๆฌกใฎๆกไปถใซใใฃใฆๅฎใใใใๆฐๅ{an} ใฎไธ่ฌ้
ใๆฑใใใ
(1) a1=3, an+1=an+2
(2) a1=5, an+1=-3an
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