Mathematics
Senior High
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数学はくくって答えた方がいいんですか?
くくらずに答えたらバツになりますか?
n
(1) (2k-7)=2k-7
2 (24-7)-22-27 1-6n
k=1
k=1
1
=2. — n ( n + 1) −7n
n(n+1)-7n
=n{(n+1)-7)= n(n-6)
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はい!ありがとうございます!