1,-2,3,-4,5,-6 求规律,今天要,

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1,-2,3,-4,5,-6求规律,今天要,1,-2,3,-4,5,-6求规律,今天要,1,-2,3,-4,5,-6求规律,今天要,第N项是:(-1)的(N+1)次方×N正数,负数,正数,负数....

1,-2,3,-4,5,-6 求规律,今天要,
1,-2,3,-4,5,-6 求规律,今天要,

1,-2,3,-4,5,-6 求规律,今天要,
第N项是:(-1)的(N+1)次方×N

正数,负数,正数,负数.....
1,2,3,4......

下一项是:7
Nnext=(N+1)*[(-1)^N]

奇数为正,偶数为负,且是正整数循环(-1)n+1 n(n=N+)