Applicare la formula: $x^2+x$$=x^2+x+\left(\frac{1}{2}\right)^2- \left(\frac{1}{2}\right)^2$, dove $x=u$, $x^2=u^2$ e $x^2+x=u^2+u$

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

Applicare la formula: $a^b$$=a^b$, dove $a=\frac{1}{4}$, $b=\frac{1}{2}$ e $a^b=\sqrt{\frac{1}{4}}$

Applicare la formula: $\frac{a}{b}c$$=\frac{ca}{b}$, dove $a=1$, $b=4$, $c=-1$, $a/b=\frac{1}{4}$ e $ca/b=- \frac{1}{4}$