(+1)+(-2)+...+(+99)+(-100)(用简便方法计算)
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发布时间:2024-10-07 20:20
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时间:2024-10-09 18:32
(+1) + (-2) + (+3) + (-4) +……+ (+99) + (-100)
= ( 1 - 2 ) + ( 3 - 4 ) +……+ ( 99 - 100 )
= ( 1 - 2X1 ) + ( 3 - 2X2 ) +……+ ( 99 - 2X50 )
= (-1) X 50
= -50