Applicare la formula: $\frac{a}{a^n}$$=\frac{1}{a^{\left(n-1\right)}}$, dove $a=x$ e $n=2$

Applicare la formula: $\frac{a}{\frac{b}{c}}$$=\frac{ac}{b}$, dove $a=3x+1$, $b=x^2-4$, $c=\frac{1}{x}$, $a/b/c=\frac{3x+1}{\frac{x^2-4}{\frac{1}{x}}}$ e $b/c=\frac{x^2-4}{\frac{1}{x}}$

Applicare la formula: $\frac{\frac{a}{b}}{c}$$=\frac{a}{bc}$, dove $a=3x+1$, $b=x$, $c=x^2-4$, $a/b/c=\frac{\frac{3x+1}{x}}{x^2-4}$ e $a/b=\frac{3x+1}{x}$