S=1-2+3-4+...+(-1)的n+1次方*n大神们帮帮忙
S=1-2+3-4+...+(-1)的n+1次方*n大神们帮帮忙
数学人气：511 ℃时间：2020-06-28 01:36:55
优质解答
若n为奇数,则s=（-1）×（n-1)÷2 若n为偶数,则s=（-1）×n÷2 （打包法）
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