|+3+5+7+9+…...+(2n-1)+(2n+1)=多少

2025-05-13 14:39:10
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解|+3+5+7+9+…...+(2n-1)+(2n+1)
=(n+1)(1+2n+1)/2
=(n+1)(n+1)
=(n+1)^2