Question

Me ajudem com estes calculos

a) (-5)+(-7)=
b) (+12)+(-8)=
c) -54=28=
d) (-12)-(-13)=
e) +30-(-8)=
f) -15+(-20)- (-13)=
g) +20+(-15)-(-10)=
h) 15.(-12).0=
i) (-20)+(-20)+(+40)=
j) +12-(-12)=

Answer 1

a) ( - 5 ) + ( - 7 )
= - 5 - 7
= -12

b) ( +12 ) + ( - 8 )
= 12 - 8
= 4

c) - 54 + 28
= - 26

d) ( -12 ) - ( -13 )
= - 12 + 13
= 1

e) + 30 - ( - 8)
= + 30 + 8
= 38

f) - 15 + ( - 20 ) - ( - 13 )
= - 15 - 20 + 13
= - 35 + 13
= - 22

g) + 20 + ( - 15 ) - ( - 10 )
= + 20 - 15 + 10
= 5 + 10
= 15

h) 15.(- 12) .0
= - 180 . 0
= 0

i) ( - 20 ) + ( - 20 ) + ( + 40 )
= - 20 - 20 + 40
= -40 + 40
= 0

j) + 12 - ( - 12 )
= + 12 + 12
= 24