1/2+1/4+1/8+1/16+...+1/二的n次方等于?
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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?
1/2+1/4+1/8+1/16+...+1/二的n次方等于?
[1/2-1/2^(n+1)]/(1-1/2)
=1-1/2^n
原式乘以2,再减去原式就出来了
(1/2*(1-(1/2)^n))/(1-1/2)
=1-(1/2)^n