Question

URGENTE
a) + (3 – 2) =
b) + (– 5 + 8) =
c) – (3 – 5 + 7) =
d) + (9 + 6 – 10) =
e) 8 + (– 3 – 3) =
f) 25 – (– 4 – 5) =
g) – 20 – (– 2 + 3) =
h) 100 – (25 – 10 + 5) =
i) 200 + (– 30 + 70 + 40 – 20) =
j) 40 – (– 30 + 10) – (– 5 + 10 + 15) =
k) 25 + (15 – 50) + (– 20 – 10) =

Answer 1

a) + (3 – 2) = +(1) =+1

b) + (– 5 + 8) = +(3) =+3

c) – (3 – 5 + 7) = - (-2+7) = - (+5) = -5

d) + (9 + 6 – 10) = +( 15 -10) = + 5

e) 8 + (– 3 – 3) = 8 + (-6) = 8-6 = +2

f) 25 – (– 4 – 5) = 25- (-9) = 25 + 9 = +34

g) – 20 – (– 2 + 3) = -20 -(+1) = - 20 - 1 = - 21

h) 100 – (25 – 10 + 5) = 100 - (15 + 5)

= 100 - 20

= +80

i) 200 + (– 30 + 70 + 40 – 20)

= 200 + ( 40 +40 -20)

= 200 + ( 80 - 20)

= 200 + 60

= 260

j) 40 – (– 30 + 10) – (– 5 + 10 + 15)

= 40 -( -20) - ( 5 + 15)

= 40 + 20 -(20)

= 60 - 20

= 40

k) 25 + (15 – 50) + (– 20 – 10)

= 25 + ( -35) + ( -30)

= 25 -35 - 30

= - 10 - 30

= - 40