Mathematics
Senior High
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解説の式変形が分かりません💦
数学的帰納法を用いて、 次の等式を証明せよ。
(1)1+4+7++(3-2)=1/2"(3n-1)
1+4+7+…………….+(3k-2)+{3(k+1)−2}
1
=k
k(3k-1)+(3k+1)
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ありがとうございます!!