Mathematics
Senior High
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この最後の部分の5n -5の部分の出し方を教えて欲しいです💦
n-1
Σ5k
k=1
(3) 5=5+52 + ......+5"-1
k=1
であるから
k=1
5"=
05-11-2(5"-1-1)=12(5"-5)
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