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負三分之一的2007次方乘以負三的2006次方 =負三分之一的2007次方乘以三的2006次方 =-(1/3×3)的2006次方×1/3 =-1的2006次方×1/3 =-1/3
=(1/3)^2006×(-3)^2006×(-3) =(-3*1/3)^2006×(-3) =(-1)^2006×(-3) =1×(-3) =-3
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