Question

Calcule:

Grupo 1:

a) +

2

3 + − 3

5 c) − 1

2 − − 2

3

b) −2,84 + −3,7 d) − 5

6 − −0,3


Grupo 2:

a) − 21

8 ⋅ 20

14 c) − 3

5 ⋅ −5

b) +3,2 ⋅ −2,1 d) −0,3 ⋅ − 5

8

Grupo 3:

a) − 3

5

÷ − 8

5 c) − 3

4

÷ +

5

3

b) −19,24 ÷ +3,7 d) −0,3 ÷ +0,2
​

Answer 1

GRUPO 1

a) (+2/3) + (-3/5) =

2/3 - 3/5 =

10/15 - 9/15 =

1/15

b) (-2,84) + (-3,7) =

-2,84 - 3,7 =

-0,86

c) (-1/2) - (-2/3) =

-1/2 + 2/3 =

-3/6 + 4/6 =

1/6

d) (-5/6) - (-0,3) =

-5/6 + 3/10 =

-25/30 + 9/30 =

-16/ 30 =

-8/15

GRUPO 2

a) (-21/8) . (20/14) =

-420/112 =

-105/28

b) (+3,2) . (-2,1) =

-6,72

c) (-3/5) . (-5) =

+15/5 =

+3

d) (-0,3) . (-5/8) =

-3/10 . -5/8 =

+15/80

GRUPO 3

a) (-3/5) ÷ (-8/5) =

(-3/5) . (-5/8) =

+15/40 =

+3/8

b) (-19,24) ÷ (+3,7) =

(-1924/100) ÷ (+37/10) =

-(1924/100) . (10/37) =

-1924/3700 =

-962/185

c) (-3/4) ÷ (+5/3) =

(-3/4) . (3/5) =

-9/45 =

-1/5

d) (-0,3) ÷ (+0,2) =

(-3/10) . (10/2) =

-30/20 =

-3/2

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