1,-2,3,-4,5,-6,7,-8,…规律用式子表示如:2,4,6,8,10,12,…用式子2n表示

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1,-2,3,-4,5,-6,7,-8,…规律用式子表示如:2,4,6,8,10,12,…用式子2n表示
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1,-2,3,-4,5,-6,7,-8,…规律用式子表示如:2,4,6,8,10,12,…用式子2n表示
1,-2,3,-4,5,-6,7,-8,…规律用式子表示
如:2,4,6,8,10,12,…
用式子2n表示

1,-2,3,-4,5,-6,7,-8,…规律用式子表示如:2,4,6,8,10,12,…用式子2n表示
n*(-1)^(n+1)

((-1)^(n+1))n

n+1
(-1) ·n

n-1
(-1)·n