Mathematics
Senior High
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(7) xの不等式 (10g2²) (10g2/04)<8を解くと
(8) 初項 1, 公差 2の等差数列{an}の第k+2項 @k+2と第2項 ak2 に
100
100
Σ ak²
k=1
"
k=1
-
ク
>
=
ケ
キ
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