Question

resolva : a)- 12+(-3)=​

Answer 1

→ Cálculo :

$\large \boxed{\begin{array}{lr} {-12+(-3)= } \\ \\ {-12-3=}\\\\{-(12+3)=}\\ \\ \boxed{\red{ -15 }} \Leftrightarrow {\rm \ Resposta} \\ \end{array}}$