Question

1)efetue
a) (-8)-(+7) C) (-30)-(+70) E) (-3)-(+7) G) (+80)-(-15)
b) (-5)-(+13) D) (-72)-(+30) F) (+10)-(+30) H) (-37)-(+20

2-CALCULE
A- (-650)-(+300) D- (+1300)-(-1100)
B- (-850)-(-850)
C- (-2100)-(+480)
3-CALCULE
A- (+8)+(-7)+(-3) D-(+10)-(-20)-(+30)
B- (+2)-(+5)-(+3) E- (-4)-(-8)-(-5)
C-(-3)+(-6)-(+30)

4-CALCULE O VALOR DAS EXPRESSOES
A)-76-(7-18)+[70-(49-81)]
B)-(-2)-7-[-18+4+(7-81)]
C)-{20-(-2-10)+[-30-(-70)]]
D) [[(73-64)+20]-(40-31)]+-(-3)

Answer 1

1)
a)(-8)-(+7)=-8-7=+15♡
b)(-5)-(+13)=-5-13=+18♡
c)(-30)-(+70)=-30-70=+100♡
d)(-72)-(+30)=-72-30=+102♡
e)(-3)-(+7)=-3-7=+10♡
f)(+10)-(+30)=+10-30=-20♡
g)(+80)-(-15)=+80+15=+95♡
h)(-37)-(+20)=-37-20=+57♡

2)
a)(-650)-(+300)=-650-300=+950♡
b)(-850)-(-850)=-850+850=0♡
c)(-2100)-(+480)=-2100-480=+2580♧

Eu não fiz todas porque eu ja vou dormir.
Espero ter ajudado!!!

Answer 2

Resposta:

Explicação passo a passo:

a)(-8)-(+7)=-8-7=+15♡

b)(-5)-(+13)=-5-13=+18♡

c)(-30)-(+70)=-30-70=+100♡

d)(-72)-(+30)=-72-30=+102♡

e)(-3)-(+7)=-3-7=+10♡

f)(+10)-(+30)=+10-30=-20♡

g)(+80)-(-15)=+80+15=+95♡

h)(-37)-(+20)=-37-20=+57♡