求1,-2,3,-4,...,99,-100这100个整数的和.
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求1,-2,3,-4,...,99,-100这100个整数的和.
求1,-2,3,-4,...,99,-100这100个整数的和.
求1,-2,3,-4,...,99,-100这100个整数的和.
(-1)+2+(-3)+4+…+(-99)+100
=(2-1)+(4-3)+…+(100-99)
=1*50
=50
两个两个一组,和为-1
一共50组
所以总和为-50