=1/2 + 1/4 + 1/8 + 1/16 + . + 1/256 + 1/512 + 1/512 - 1/512
=1/2 + 1/4 + 1/8 + 1/16 + . + 1/256 + 1/256 - 1/512
=.
=1/2 + 1/2 - 1/512
=1 - 1/512
=511/512
1/2+1/4+1/8+1/16+······+1/512
1个回答
相关问题
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