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来源：学生作业帮助网编辑：作业帮时间：2024/06/02 03:56:54

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1+1/2+1/4+1/8-1/16+1/32+1/64-1/128+1/256
1+1/2+1/4+1/8-1/16+1/32+1/64-1/128+1/256