Question

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

Answer 1

a)

$-76-(-7-18)+[70-(49-81)]\\-76-(-25)+[70-(-32)]\\-76+25+[70+32]\\-76+25+102\\-51+102\\51$

b)

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