Question

Answer 1

\(a,\dfrac{1}{7}:-\dfrac{6}{21}=\dfrac{1}{7}.-\dfrac{21}{6}=-\dfrac{21}{42}=-\dfrac{1}{2}\)

Answer 2

\(\dfrac{1}{7}:\left(-\dfrac{6}{21}\right)\\ =\dfrac{1}{7}\times\left(-\dfrac{21}{6}\right)\\ =\dfrac{1\times\left(-21\right)}{7\times6}\\ =-\dfrac{21}{42}\\ =-\dfrac{1}{2}\)