Mathematics
Senior High
最初の式で、なぜ1/5でくくれるのかおしえてください！
(5)
であるから
=
-135K+4)=(5-1-54²+4)
"}
1
Σ
k=1 (5k-1)(5k+4)
=>
= 23 (5k-1-5k²+4)
5
k=1
+
19
(4-1) + (-1) + (1 - 1)
+ (5m²=1-5m²+4)}
=1/(
5 4
1
5n+4
n
4(5n+4)
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