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2的一百次方减2的99次方减2的98次方减省略號减2的2次方减2减1 =2^100-2^99-……-2^2-2-1 =2^99*(2-1)-2^98-……-2^2-2-1 =2^99-2^98-……-2^2-2-1 =2^2-2-1 =1
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