Applicare la formula: $x\cdot x^n$$=x^{\left(n+1\right)}$, dove $x^nx=\frac{3}{5}\cdot \frac{2}{9}xx^4$, $x^n=x^4$ e $n=4$

Applicare la formula: $a+b$$=a+b$, dove $a=4$, $b=1$ e $a+b=4+1$

Applicare la formula: $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, dove $a=3$, $b=5$, $c=2$, $a/b=\frac{3}{5}$, $f=9$, $c/f=\frac{2}{9}$ e $a/bc/f=\frac{3}{5}\cdot \frac{2}{9}x^{5}$

Applicare la formula: $ab$$=ab$, dove $ab=5\cdot 9$, $a=5$ e $b=9$

Applicare la formula: $ab$$=ab$, dove $ab=3\cdot 2$, $a=3$ e $b=2$