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2的99次方×負2分之1的100次方 =2的99次方×負2分之1的99次方×(-1/2) =(-1/2×2)^99×(-1/2) =(-1)^99×(-1/2) =1/2
3的100次方×(負3分之一)的99次方 =3×3的99次方×(負3分之一)的99次方 =3×(3×負3分之一)的99次方 =3×(負1)的99次方 =負3
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