Mathematics
Senior High
Resolved
数Bの問題です。オレンジの〜線の式を出すまでの途中式を教えてください。よろしくお願いします。
(Point)
S=5.147.34938411.324
K=
(2k 4.3) 3K-1
×
3
K=1
(2k43) 3F-1
N
kal
一般項が毒(等と)
(2+3)-3-
S=3.1+
7.3 +93 +11.34+ (2n+31.301
BS
-25=514
5.3 + 13° +9.33 ++ (24411-3" 2nd
2.3+2.30+233+
2.3112113135
-25=
54
6(301-11
(24+3). 35
3-1
-2S
2S=
S =
2
n
5+3(3-1)-(2n+3)-3m
-20
=5+34-3-3(2n+31
-2.34 (n+1)+2
どうやって
計算すればいい
かわからないです。
3" (n+1)-1 (n=1のとき成立)
Answers
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