Mathematics
Senior High
最初の式でなぜ1/5でくくれるのか教えてください！
(5)
であるから
1
(5k-1)(5k+4)
=
1
Σ
k=1 (5k-1)(5k+4)
= 2 (5k²-1-5k²+4)
5
1 1
1
1
1
1
1
-(4- ) + ( ) + ( +
9
9
14
14
19
=
1/1
1
-(4-52²+4)
1 / 1
1
5 5k-1 5k+4
n
4(5n+4)
+
1
5n-1 5n+4
1
(4)}
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