Mathematics
Senior High
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(1)カッコで括らなくてもいいですよね?
71 次の和Sを求めよ。
1
1
1
*(1) S=-
S=2-5 + 5-8 + 8-11
+
・+
1
(3n-1)(3n+2)
71 (1)
1
1
1/3 ( 3 K ²
(3k-1)(3k+2)
であるから
一
(
(π - ³ ) + ( ² - ² ) ƒ + (1 - ³)f=s
8
=1/(1/2-
1
3n+2
n
= 2(3n+2)
-3k+2)
3k-1 3k+2,
1/
++ 3 (3²-1-3n+2)
h
6htf
・
1
3 2(3n+2)
(3n+2)-2
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