Applicare la formula: $\left(a+b\right)^3$$=a^3+3a^2b+3ab^2+b^3$, dove $a=2x$, $b=\frac{1}{3}x^2$ e $a+b=2x+\frac{1}{3}x^2$

Applicare la formula: $\left(ab\right)^n$$=a^nb^n$

Applicare la formula: $\frac{a}{b}c$$=\frac{ca}{b}$, dove $a=1$, $b=9$, $c=6$, $a/b=\frac{1}{9}$ e $ca/b=6\cdot \left(\frac{1}{9}\right)xx^{4}$

Applicare la formula: $x^mx^n$$=x^{\left(m+n\right)}$, dove $m=2$ e $n=2$

Applicare la formula: $x\cdot x^n$$=x^{\left(n+1\right)}$, dove $x^nx=\frac{2}{3}x\cdot x^{4}$, $x^n=x^{4}$ e $n=4$