a) [tex]\frac{1}{4x^{2}} :\frac{5}{8x}=\frac{1}{4x^{2}} *\frac{8x}{5}=\frac{8x}{20x^{2}} =\frac{2}{5x}=0,4x[/tex]
b)[tex]\frac{x+1}{x^{2}}:\frac{2x+2}{3x}=\frac{x+1}{x^{2}}*\frac{3x}{2*(x+1)}=\frac{3x*(x+1)}{2x^{2}*(x+1)}=\frac{3}{2x}=1,5x[/tex]
