Since #3/sqrt(3)# has a radical in its denominator, you must do a process known as rationalization. Rationalization is when you must multiply the whole fraction by another fraction where the numerator and denominator are #sqrt(3)#. By doing so, you remove the radical, since #sqrt(3)# #(1.7320508...)# is irrational, that is, the decimal goes on forever without repeating.
#3/sqrt(3)color(red)(*sqrt(3)/sqrt(3))#
#=(3color(red)(*sqrt(3)))/(sqrt(3)color(red)(*sqrt(3)))#
#=(3sqrt(3))/3#
Notice how once you rationalize the fraction, the denominator is not irrational anymore. Also, keep in mind that you did not change the value of the simplified fraction. Since #sqrt(3)/sqrt(3)# is equal to #1#, you simply rearranged the way it was written. The value of the simplified fraction stays the same.
