(1/2008-1)x(1/2007）x（1/2006-1）x.x（1/1998-1）
= （-2007/2008）×（-2006/2007）×……×（-1997/1998） 共有奇数个数字相乘
= -1997/2008
(1/2008-1)x(1/2007）x（1/2006-1）x.x（1/1998-1）
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