Question

1) Calcule o valor da seguinte expressão numérica: 20 - (16 + 17) - [15 - (18 - 23)] *
1 point
a) -30.
b) -31.
c) -32.
d) -33.

Answer 1

→ Cálculo :

⇔ Alternativa correta Letra D

$\boxed{\begin{array}{lr} {20-(16+17)-[15-(18-23)]} \\ \\ {20-33-[15-(-5)]}\\ \\ {20-33-[15+5] } \\\\{20-33-20}\\\\{-13-20}\\ \\ \boxed{\red{ -33 }} \Leftrightarrow {\rm \ Resposta} \\ \end{array}}$

Answer 2

Explicação passo-a-passo:

$\tt 20\:-\:\left(16\:+\:17\right)\:-\:\left[15\:-\:\left(18\:-\:23\right)\right]\\\\\\\tt =20-33-\left[15-\left(18-23\right)\right]\\\\\\\tt =20-33-20\\\\\\\to \boxed{\tt =-33}$