Mathematics
Senior High
1/5でくくれる理由がわからないので教えて欲しいです！
(5)
-135k+4)=(5x-1-5k+4)
であるから
=
91
1
Σ
k=1 (5k-1)(5k+4)
= 2½ (5k-1-5k+4)
5
k=1
//(1-1/2)+(1-1/4)+(1/14-116)
9
9
=
-1 (1-52²+4)
5
12
4(5n+4)
+
19
1
1
5n-1 5n+4
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