\"\"

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The expression is \"\".

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The logarithmic values are \"\", \"\" and \"\".

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Simplify the expression.

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\"\"                                     (Original expression)

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\"\"                          (Substitute: \"\")

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\"\"    (Logarithm product property:\"\")

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\"\"         (Substitute corresponding logarithm values)

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\"\"                                   (Addition)

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\"\".

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Therefore, approximate value of the expression is \"\".

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\"\"

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The approximate value of the expression is \"\".