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2的負(2k+1)=1/(2^(2k+1)) 2的負(2k-1)次方=1/(2^(2k-1)) 2的負2k次方=1/(2^(2k)) 原式=1/(2*4^k)-2/4^k+1/4^k =(1/2)*1/4^k-1/4^k =-1/(2*4^k) =-2^-(2k+1)
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