Mathematics
Senior High
Solved
赤矢印の変形がどうなってるのか分かりません!教えてください!
2
4
(1)
S=1+²/3 + 3³2 +3³
S=1+
33
この等式の両辺を3で割ると
1/3 s= 1/3+2/²2/2+3/3/³3
33
(I+SI+
辺々引くと
²/-s=
1
²/² = 1 + 2/3 + 2/3/2 + 1/²/3/
1
3²
33
したがって
1{1-(-/-)"}
3
3
2
1-
2n +3
よってS=
+
itoo
I ti
2.3" @
.....
+
·+·
3"
S)S+(1+x))(I
9 2n+3
4 4.3"-1
+
n
3n-1 41)
(n+3/1+1
=
2
1
3n-1
1
3 $184 (8+)(1+
(M) Ž
n-1 n
+
3n-13"
3"
Jel
3+
n
3"
n
3"
11
DES
Answers
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