(1) 1+(-2)+3+(-4)+````````+99+(-100); (2)1+(-2)+3+(-4)+5+(-6)+``````````+(2n-1)=(-2n)(1) 1+(-2)+3+(-4)+````````+99+(-100)=(2)1+(-2)+3+(-4)+5+(-6)+``````````+(2n-1)=(-2n)=这两题目等于多少?
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