Question

resolva as adições algébricas:
(-12)+(+15)
(-23)+(-9)
(+52)-(-14)
(-28)-(+13)
-10+(-18)+5
42+(-27)+(-31)
7+(-34)-(-21)-(+8)

Answer 1

a) (-12)+(+15)                         + com + = +

-12 + 15 = 3

b) (-23)+(-9)                            + com - = -

-23 - 9 = -32

c) (+52)-(-14)                          - com - = +

+52 + 14 = 66

d) (-28)-(+13)                         - com + = -

-28 - 13 = -41

e) -10 +(-18)+5                      + com - = -

-10 -18 +5 =

-28 + 5 = -23

f) 42+(-27)+(-31)                   + com - = -

42 - 27 - 31 =

42 - 58 = -16

g) 7+(-34)-(-21)-(+8)             + com - = -        - com - = + 

7 - 34 + 21 - 8 =

28 - 42 = -14