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2的2006次方乘以2分之1的2005次方 =2*[2*(2分之1)]的2005次幂 =2*1的2005次幂 =2
4的2005次方乘以0.25的2006次方 =4的2005次方乘以0.25的2005次方×0.25 =0.25
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