Applicare la formula: $a+\frac{b}{c}$$=\frac{b+ac}{c}$, dove $a=1$, $b={\left(-1\right)}^n$, $c=n$, $a+b/c=1+\frac{{\left(-1\right)}^n}{n}$ e $b/c=\frac{{\left(-1\right)}^n}{n}$

Applicare la formula: $1x$$=x$, dove $x=n$

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