1/9^log以3为底7 求值

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1/9^log以3为底7 求值

1/9^log以3为底7 求值
1/9^log以3为底7 求值

1/9^log以3为底7 求值
1/9^log以3为底7
=3^-2log以3为底7
=3^log以3为底7^-2
=7^-2
=1/49