Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=d^{-2}$, $a^m=d^{11}$, $a=d$, $a^m/a^n=\frac{-2d^{11}f^5}{4d^{-2}f^2}$, $m=11$ e $n=-2$

Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=f^2$, $a^m=f^5$, $a=f$, $a^m/a^n=\frac{-2d^{13}f^5}{4f^2}$, $m=5$ e $n=2$

Applicare la formula: $\frac{ab}{c}$$=\frac{a}{c}b$, dove $ab=-2d^{13}f^{3}$, $a=-2$, $b=d^{13}f^{3}$, $c=4$ e $ab/c=\frac{-2d^{13}f^{3}}{4}$