Question

1)calcule as somas:
a)0+(+35)
b)(-60)+0
c)(-25)+(+25)
d)(-9)+(+21)
e)(-90)+(+50)
f)(91)+(-9)
g)(-8)+(-6)+(+20)
h)(+4)+(+12)+(-30)+(+3)
i)(-5)+(-5)+(-5)+(+5)
j)(+12)+(-7)+(+8)+(-3)

Answer 1

a) 0 + (+35) = 35

b) - 60 + 0 = - 60

c) - 25 + (+25) = - 25 + 25 = 0

d) - 9 + ( + 21) = - 9 + 21 = 12

e) - 90 + (+50) = - 90 + 50 = - 40

f) 91 + ( - 9) = 91 - 9 = 82

g) (- 8) + ( - 6) + ( + 20) = - 8 - 6 + 20 = - 14 + 20 = 6

h) + 4 + (+12) + (- 30) + (+3) = + 4 + 12 - 30 + 3 = 4 + 12 + 3 - 30 = - 11

i) (- 5) + ( - 5) + ( - 5) + (+ 5) = - 5 - 5 - 5 + 5 = - 15 + 5 = - 10

j) + 12 + ( - 7) + ( + 8) + ( - 3) = + 12 - 7 + 8 - 3 = + 12 + 8 - 7 - 3
= 20 - 10 = 10