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1、n=1的時候顯然成立2、假設當n=k的時候,命題成立即k+(k+1)+(k+2)…+2k=3k(k+1)/2當n=k+1時k+1+(k+1+1)+(k+1+2)……+2k+(2k+1)+(2k+2)由假設可知原式=3k(k+1)/2 -k+2k+1+2k+2=3(k+1)(k+2)/2由1、2可…
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