\[ 5,07 \cdot 10\,^{-6} \, = \, 5,07 \cdot \displaystyle{{1 \over 10\,^6} \, = \, 5,07 \cdot {1 \over 1\,000\,000} \, = \, 5,07 \cdot 0,000\,001} \, = \]