Mathematics
Senior High
ここの途中式でなぜ1/5でくくれるのか分からないので教えてください！
(5)
1
(5k-1)(5k+4)
であるから
||
PL
1
2
k=1 (5k-1)(5k+4)
1
55k-1
1
5k+4
=1/{(1/1-1)+(1-1/4)+(1/-1/16) +
+ (5m²-1-5m²+4)
9
>
k=1
9
= 1/(1-52²+4)
n
4(5n+4)
1
1
1
5 5k-1 5k+4
19
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