Mathematics
Senior High
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数Bです!49kはどこから来たのでしょうか?
n=k+1のときを考えると
23+1-7(k+1)-1=8-23-7k-8
=8(23-7k-1)+49k
= 49(8m + k)
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分かりやすいです!ありがとうございます!