Ответ:

а) m/√x = (m√x)/x = m√x/x.

б) 1/√2 = √2/2 = √2/2.

в) 3/(5√c) = (3√c)/(5c) = 3√c/(5c).

г) a/(2√3) = (a√3)/6 = a√3/6.

д) 3/(2√3) = (3√3)/6 = √3/2.

е) 5/(4√15) = (5√15)/60 = √15/12.