Question

calcule o valor das expressoes
a)-76-(7-18)+[70-(49-81)]
b){[(73-64)+20]-(40-31)}+(-3)

Answer 1

Resposta:

A.

$-76-(7-18)+[70-(49-81)] =\\-76-(-11)+[70-(-32)] =\\-76+11+[70+32] =\\-76+11+102 =\\ 37$

B.

$\{[(73-64)+20]-(40-31)\}+(-3) = \\\{[(9)+20]-(9)\}+(-3) =\\\{[9+20]-9\}-3=\\\{29-9\}-3=\\20-3=\\17$