数列-1/2×1,1/2×2,-12×3,1/2×4的通项公式

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数列-1/2×1,1/2×2,-12×3,1/2×4的通项公式数列-1/2×1,1/2×2,-12×3,1/2×4的通项公式数列-1/2×1,1/2×2,-12×3,1/2×4的通项公式(-1)^n/

数列-1/2×1,1/2×2,-12×3,1/2×4的通项公式
数列-1/2×1,1/2×2,-12×3,1/2×4的通项公式

数列-1/2×1,1/2×2,-12×3,1/2×4的通项公式
(-1)^n/(2*n)即负一的n次方除以2n

n*(1/2)*(-1)^-n