.

47. Calcula las siguientes operaciones combinadas con números enteros:

a) –12 + (-64) + (-17) + 4 =

b) 25 – 50 – 56 + 50 – 25 + 56 =

c) 3 ⋅ [-3 + (-3)] – 14 : (-7) =

d) 2 ⋅ [3 + (-2) ⋅ 5] + (-2)⋅(-5)⋅(-3) =

e) – 6 – 5 ⋅ [5 (-2) – 5] + (-5) ⋅ 4 =

f) –9 : 3 – [ (8 –10) – (9 - 2)] =

g) [(-4) 2 + 20 ] : (-4) + 2 (9 : (-3)) =

h) (-35) : (-5) – 3 ⋅ (5 – 7) =

i) [(-4) : (+2)] – [(+7) – (-2)] =

j) [(+3) - (+5) + (+4)] : [(+15) : (-3) – (-7)] =

k) -13⋅ (+3) - (-12) ⋅ (+7) =

l) [(-25) + 5 - (-2)] : (-8)=

m) –8 ⋅ [ 5 - (-2 )] – 48 : [6 + (-14)]=

n) –11 ⋅ [10 + (-7)] + 36 : [(-1) - (-10)] =

o) 42 : [(-6) – (-3)] + 28 : [-6 - (-8)]=

p) 8 · [-5 · (-2 + 4) – (5 – 3)] : (-4) =

q) 28 – [(7 – 2) · (15 – 21)] + 6 · (-4) =

r) (8 – 14) : [(7 – 12) + (15 – 12)] · 7 =

s) [-17 + (11 – 16)] – [(-2 + 7) · (25 – 20)] =

t) (5 – 2) · (2 – 5) (-2) : (-3) =

u) 12 – 2 · 6 + 2 – 5 · (-6) : (-3) =

v) -2 – 2 · (1 – 7) : (-2) : ( -3) =

w) (-2 + 10) · 3 : 6 · (-2) – 3 =

48. Completa con los números enteros correspondientes.

a) (+9) ⋅ ........ = −36

b) (−7) ⋅ ........ = +21

c) ........ ⋅ (−8) = −40

d) ........ ⋅ (+10) = −100

e) (−30) ⋅ ........ = +30

f) (+6) ⋅ ........ = 0

49. Completa con los números enteros correspondientes.

a) (+42) : ........ = −7

d) (−20) : ........ = −20

b) (−8) : ........ = +1

e) ........ : (−6) = +5

c) ........ : (−9) = +6

f) (+9) : ........ = −9