Applicare la formula: $\left(a+b\right)^2$$=a^2+2ab+b^2$, dove $a=\frac{2}{3}a^2$, $b=-\frac{1}{5}ab^2$ e $a+b=\frac{2}{3}a^2-\frac{1}{5}ab^2$

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

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

Applicare la formula: $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, dove $a=4$, $b=3$, $c=-1$, $a/b=\frac{4}{3}$, $f=5$, $c/f=-\frac{1}{5}$ e $a/bc/f=\frac{4}{3}\cdot -\frac{1}{5}a^{3}b^2$