Applicare la formula: $\left(a+b\right)^3$$=a^3+3a^2b+3ab^2+b^3$, dove $a=\frac{3}{5}x$, $b=\frac{4}{3}y$ e $a+b=\frac{3}{5}x+\frac{4}{3}y$

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

Applicare la formula: $\frac{a}{b}c$$=\frac{ca}{b}$, dove $a=9$, $b=25$, $c=4$, $a/b=\frac{9}{25}$ e $ca/b=4\cdot \left(\frac{9}{25}\right)x^2y$

Applicare la formula: $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, dove $a=9$, $b=5$, $c=16$, $a/b=\frac{9}{5}$, $f=9$, $c/f=\frac{16}{9}$ e $a/bc/f=\frac{9}{5}\cdot \frac{16}{9}xy^2$