log1/3^27-log1/3^9怎么算
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log1/3^27-log1/3^9怎么算
log1/3^27-log1/3^9怎么算
log1/3^27-log1/3^9怎么算
=log1/3(3^3)-log1/3(3^2)
=log1/3[(1/3)^(-3)]-log1/3[(1/3)^(-2)]
=-3-(-2)
=-1
log1/3^27-log1/3^9
=27lg1/3-9lg1/3
=18lg1/3
=-18lg3
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