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分析: 1+3=1+(2*2-1)=4=2*2 1+3+5=1+3+(2*3-1)=8=? 不對! 1+3+5+7+.+(2n+1)=4n 分析: n=1時 1+3=4=4*1 n=2時 1+3+5=8=4*2 . 這個公式成立!而且跟你的計算內容同:1+3+5+7+.
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