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1/[n×(n+3)]=[(1/n)-(1/n+3)]×1/3.按著這個式子,每一個都可以拆開,中間項全消了,只剩下1和1/2008.所以結果就是(1-1/2008)×1/3,也就是669/2008.希望樓主滿意~~~
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