Question

determine as seguintes somas:

a) (-8)+(+10)+(+7)+(-2)

b) (+20)+(-19)+(-13)+(-8)

c) (-5)+(+8)+(+2)+(+9)

d) (-1)+(+6)+(-3)+(-4)+(-5)

e) (+10)+(-20)+(-15)+(+12)+(+30)+(-40)​

Answer 1

a) -8+10+7-2= 7
b) 20-19-13-8= -20
c) -5+8+2+9= 14
d) -1+6-3-4-5= -7
e) 10-20-15+12+30-40= -23

Answer 2

Resposta:

Determine as seguintes somas:

a) (-8)+(+10)+(+7)+(-2)

= -8+10+7 - 2

= 2 + 7 - 2

= 7

b) (+20)+(-19)+(-13)+(-8)

= 20 - 19 - 13 - 8

= 1 - 21

= - 20

c) (-5)+(+8)+(+2)+(+9)

= -5+8+2+9

= 3+11

= 14

d) (-1)+(+6)+(-3)+(-4)+(-5)

= -1+6-3-4-5

= 5-12

= - 7

e)

(+10)+(-20)+(-15)+(+12)+(+30)+(-40)​

= 10 - 20 - 15 +12 + 30 - 40

= (10) - 35 + 12 - 10

= - 23