Die korrekte Antwort lautet:
12 : 2 = 6

$2·(37-\left(39+38\right))$

= $2·\left(37-39-38\right)$

= $2·\left(-40\right)$

= $-80$

${\left(-3\right)}^2+{\left(-4\right)}^2$

= $9+16$

= $25$