Question

Resolva as adições algébricas e marque a alternativa correta: (–9) – (+7) + (+13) – (–20) *
1 ponto
-17
+17
31
-21

Answer 1

→ Cálculo :

$\large \boxed{\begin{array}{lr} {(-9)-(+7)+(+13)-(-20)} \\ \\ {-9-7+13+20}\\\\{-16+13+20}\\\\{-16+33}\\ \\ \boxed{\red{ \ +17 \ }} \Leftrightarrow {\rm \ Resposta} \\ \end{array}}$