Question

1.Calcule com cuidado:

a) (+8)-(+5)-(0)

b) (-8)+(-7)+(-8)

c) (+9)-(+2)-(+7)

d) (+15)+(-18)-(-14)


2.Observe e calcule:

a) (+8)-(-15)+(-12)+(-3)+(-5)-(9)

b)(-15)+(-17)-(-20)+(-22)+(-12)+(-10)+(-2)+(-18)

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Answer 1

1.

a) (+8)-(+5)-(0)

8 - 5 - 0

3 - 0

3

b) (-8)+(-7)+(-8)

-8 - 7 - 8

-15 - 8

-23

c) (+9)-(+2)-(+7)

9 - 2 - 7

7 - 7

0

d) (+15)+(-18)-(-14)

15 - 18 + 14

3 + 14

17

2.

a) (+8)-(-15)+(-12)+(-3)+(-5)-(9)

8 + 15 - 12 - 3 - 5 - 9

23 - 15 - 5 - 9

23 - 20 - 9

23 - 29

-6

b)(-15)+(-17)-(-20)+(-22)+(-12)+(-10)+(-2)+(-18)

-15 - 17 + 20 - 22 - 12 - 10 - 2 - 18

-32 + 20 - 64

-12 - 64

-76