2分之1+4分之1+8分之1+16分之一...+512分之1=
2分之1+4分之1+8分之1+16分之一...+512分之1=
要简便运算,
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要这样回答的啊
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要简便运算,
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要这样回答的啊
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数学人气：971 ℃时间：2020-03-27 08:24:17
优质解答
1/2+1/2^2+1/2^3+...+1/2^9=(1/2)x[1-(1/2)^9]/(1/2)=1-1/2^9=511/512
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