We have already seen how to enter some simple fractions. Fractions with complicated numerators or denominators must have the numerator and/or denominator surrounded by brackets. These brackets will not be displayed, they are used as logical brackets so that you clearly indicate the elements that comprise the numerator and denominator.
Examples:
is entered as (3x+2)/4
is entered as ((x+1)2(x+2))/(x+1)
is entered as x=(-b +- sr(b2-4ac))/2a or you can use the qf standard shortcut.
is entered as 1/(1+4x^(3x/2)+1/(2x2+1/2))