2) Calcule as expressões numéricas:

a) 7-(1+3)=

b) 9-(5-1+2)=

c) 10-(2+5)+4=

d) (13-7)+8-1=

e) 15-(3+2)-6=

f) (10-4)-(9-8)+3 =

g) 30-(5+3) =

h) 15+(8+2) =

i) 15-(10-1-3) =

j) 23-(2+8)-7 =

k) (10+5)-(1+6) =

l) 7-(8-3)+1=

m) 15+[6+(8-4:2)] =

n) 40-[3+(10-2):2] =

o) [30+2x(5-3)]x2-10 =

p) 10+[4+(7x3+1)]-3 =

q) 25-[10+(7-4)] =

r) 32+[10-(9-4)+8] =

s) 45-[12-4+(2+1)] =

t) 50-[37-(15-8)] =

u) 28+[50-(24-2)-10] =

v) 20+[13+(10-6)+4] =

w) 52-{12+[15-(8-4)]} =

Exercício 1 ------ Exercício 3