计算:-1-2+3+4-5-6+7+8``````+2007+2008 急用

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计算:-1-2+3+4-5-6+7+8``````+2007+2008急用计算:-1-2+3+4-5-6+7+8``````+2007+2008急用计算:-1-2+3+4-5-6+7+8``````+

计算:-1-2+3+4-5-6+7+8``````+2007+2008 急用
计算:-1-2+3+4-5-6+7+8``````+2007+2008 急用

计算:-1-2+3+4-5-6+7+8``````+2007+2008 急用
每四个数为一组,每组四个数的和为4,原式有502组,和共为502个4,即2008