Mathematics
Senior High
Solved
4行目からの解説お願いします🙇♀️
(2)
11
2
kkk.+.2)
=
k
1
k+2
=(1-1/2)+(/2-1/2)+(1/13-1/2)+(1/-1/2)+
+
5
+
(11/21)+(1/144) (11)
n-2
n-1
n+
=1+
+/12/
1
1
n+1 n+2
n+2
n(3n+5)
2(n+1)(n+2)
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