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求高人翻译 标题要长~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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the first three terms of a sequence by U1=10 U2=6 U3=5 . Given that Un is a quadratic polynomial in n ,find Un in terms of n。 这是到数列的题目吗? 还是别的? 我看不懂额..


1楼2011-06-27 20:06回复