[1/2-1/2^(n+1)]/(1-1/2)
=1-1/2^n
1/2+1/4+1/8+1/16+...+1/二的n次方等于?
1/2+1/4+1/8+1/16+...+1/二的n次方等于?
数学人气：461 ℃时间：2019-10-19 00:15:56
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