4) Calcule as expressões numéricas:

a) 10 - 5 - 2 + 3 =

b) 10 - ( 5 + 2) + 3 =

c) ( 10 - 5) - ( 2 + 3) =

d) 10 - ( 5 - 2 + 3) =

e) ( 17 + 9 ) - 8 - ( 11 + 4) =

f) 86 + ( 31 - 16 + 60 ) - ( 200 - 70 - 50 ) =

g) ( 79 + 21 - 84) + ( 63 - 41 + 17 ) - 26 =

h) 30 – ( 5 + 3 ) =

i) 15 + ( 8 + 2 ) =

j) 25 – ( 10 – 1 – 3 ) =

k) 45 – 18 + 3 + 1 – 2 =

l) 75 – 10 – 8 + 5 – 1 =

m) 10 + 5 – 6 – 3 – 3 + 1 =

n) 23 – ( 2 + 8 ) – 7 =

o) ( 10 + 5 ) – ( 1 + 6 ) =

Exercício 3 ----- ----- Exercicio 5