Question

r). {3+ [5 - (2 + 1) +7]}

Answer 1

→ Cálculo :

$\large \boxed{\begin{array}{lr} {\left \{ 3+[5-(2+1)+7] \right \}= } \\ \\ {\left \{ 3+[5-3+7] \right \} = }\\ \\ { \left \{ 3+[12-3] \right \} = } \\\\{3+9= }\\ \\ \boxed{\red{ \ 12 \ }} \Leftrightarrow {\rm \ Resposta} \\ \end{array}}$

Answer 2

Olá

> {3 + [5 - (2 + 1) + 7]}

> {3 + [5 - 3 + 7]}

> {3 + [2 + 7]}

> {3 + 9}

> 12

>< 12 ><

Espero ter ajudado!