计算:(1+2的负八分之次方)(1+2的负四分之次方)(1+2的负二分之次方)
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计算:(1+2的负八分之次方)(1+2的负四分之次方)(1+2的负二分之次方)
计算:(1+2的负八分之次方)(1+2的负四分之次方)(1+2的负二分之次方)
计算:(1+2的负八分之次方)(1+2的负四分之次方)(1+2的负二分之次方)
原式=(1-2^-8)(1+2^-8)(1+2^-4)(1+2^-2)/(1-2^-8)
=(1-2^-4)(1+2^-4)(1+2^-2)/(1-2^-8)
=(1-2^-2)(1+2^-2)/(1-2^-8)
=(1-2^-1)/(1-2^-8)
=(1/2)/(1-1/256)
=128/255