Applicare la formula: $\left(a+b\right)^3$$=a^3+3a^2b+3ab^2+b^3$, dove $a=\frac{x^4}{9}$, $b=-\frac{7}{6}$ e $a+b=\frac{x^4}{9}-\frac{7}{6}$

Applicare la formula: $\left(\frac{a}{b}\right)^n$$=\frac{a^n}{b^n}$, dove $a=x^4$, $b=9$ e $n=3$

Applicare la formula: $\left(\frac{a}{b}\right)^n$$=\frac{a^n}{b^n}$, dove $a=x^4$, $b=9$ e $n=2$

Applicare la formula: $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, dove $a=-7$, $b=2$, $c=x^{8}$, $a/b=-\frac{7}{2}$, $f=81$, $c/f=\frac{x^{8}}{81}$ e $a/bc/f=-\frac{7}{2}\frac{x^{8}}{81}$

Applicare la formula: $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, dove $a=x^4$, $b=9$, $c=49$, $a/b=\frac{x^4}{9}$, $f=36$, $c/f=\frac{49}{36}$ e $a/bc/f=3\cdot \left(\frac{49}{36}\right)\left(\frac{x^4}{9}\right)$