Question 1129167

{{{(4- 25x^-2 )/(4- 20x^-1 + 25x^-2)}}}



{{{(4- 25(1/x^2) )/(4- 20(1/x) + 25(1/x^2))}}}



{{{(4- 25/x^2 )/(4- 20/x + 25/x^2)}}}



{{{((4x^2- 25)/cross(x^2) )/((4x^2- 20x + 25)/cross(x^2)))}}}



{{{((2x)^2- 5^2)/((2x)^2- 20x + 5^2)}}}



{{{(cross((2x - 5)) (2x + 5))/(2x-5)^cross(2)}}}



{{{ (2x + 5)/(2x-5)}}}