Question

calcule o valor da expressão

a) -76-(7-18)+[70-(49-81)]
b)-(-2)-7-[-18+4+(7-15)]
c)-{20-(2-10)+4+(7-15)]
d){[73-64)+20]-(40-31)}+(-3)

Answer 1

a) -76-(7-18)+[70-(49-81)]=
76-11+[70-32]=
76-11+38=
76-49=
27

b)-(-2)-7-[-18+4+(7-15)]=
(-2)-7-[18+4+8]=
(-2)-7-[22+8]=
(-2)-7-30=
5-30=
25

c)-{20-(2-10)+4+(7-15)]=
{20-8+4+8}=
{12+4+8}=
{16+8}=
24

d){[73-64)+20]-(40-31)}+(-3)
{[9+20]-9}+(-3)=
{29-9}+(3)=
20+3=
23