计算题:-1+3+(-5)+7+(-9)+``````+2003+(-2005)

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计算题:-1+3+(-5)+7+(-9)+``````+2003+(-2005)
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计算题:-1+3+(-5)+7+(-9)+``````+2003+(-2005)
计算题:-1+3+(-5)+7+(-9)+``````+2003+(-2005)

计算题:-1+3+(-5)+7+(-9)+``````+2003+(-2005)
-1+3+(-5)+7+(-9)+``````+2003+(-2005)
=[-1+3]+[-5+7]+...+[-2001+2003]+[-2005]
=2+2+...+2-2005
=2*501-2005
=-1003