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Lösung 3.3:4b

Wir verwenden das Logarithmengesetz \displaystyle \lg a + \lg b = \lg (ab):

\displaystyle \lg 23 + \lg\frac{1}{23} = \lg \Bigl(23\cdot\frac{1}{23}\Bigr) = \lg 1 = 0\,\textrm{.}