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你好! 1=2的01方-1 3=2²;-1 7=2³;-1 15=2的四次方-1 31=2的五次方-1 63=2的六次方-1 127=2的7次方-1 ······ n=2的n次方-1 希望我的回答對你有所幫助.
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