Question

4)Aplique a Regra das operações entre frações e encontre as soluções.


a)2/8 + 1/7 =

b) (-3/4)+2/7 =

c)1/9×(-8/3)=

d)2/8 : 3/7 =

e)(-8/4)×(-6/3) =

F)(-1/5) + (-1/5) =
​

Answer 1

A)11/28

B)- 13/38

C)- 8/27

D)7/12

E)4

F)- 2/5

A)2/8 + 1/7=

2/8 + 1/7

2/8

2÷2/8÷2

1/8 ÷ 2

2÷2/8÷2

1/4

+ 1/7

1/4 + 1/7

1×1/4×7 + 1/7

1/4 + 1/7

1×7/4×7 + 1×4/7×4

7/4×7 + 1/4/7×4

1×7/4×7 + 1×4/7×4

7/28 + 1×4/7×4

1×7/4×7 + 1×4/7×4

7/28 + 4/7×4

1×7/4×7 + 1×4/7×4

7/28 + 4/28

7+4/28

1/4 + 1/7

7+4/28

11/28

Resposta

11/28

B)(- 3/4)+2/7

(-3/4)+2/7

- 3/4 + 2/7

-21 + 8/28

-13/28

-13/28

- 3/4 + 2/7

-13/28

Resposta

-13/28

C)1/9×(-8/3)

1/9×(-8/3)

- 1/9× 8/3

1/9×(-8/3)

- 1/9 × 8/3

- 1×8/9×3

- 8/9×3

- 1×8/9×3

- 8/27

1/9×(-8/3)

- 8/27

Resposta

- 8/27

D)2/8 ÷ 3/7

2/8 ÷ 3/7

2/8 × 7/3

2/8 ÷ 3/7 aqui risque os dois numeros 2 e 8

1/4 × 7/3

1×7/4×3

7/4×3

1×7/4×3

7/12

1/4 × 7/3

7/12

Resposta

7/12

E)(- 8/4) × (- 6/3)

(- 8/4) × (- 6/3)

8/4 × 6/3

(- 8/4) × (- 6/3) aqui risque os dois numeros 8 e 4

2× 6/3

(- 8/4) × (- 6/3) aqui risque os dois numeros 6 e 3

2×2

4

Resposta

4

F)(- 1/5) + (- 1/5)

(- 1/5) + (- 1/5)

- 1/5 + (- 1/5)

(- 1/5) + (- 1/5)

- 1/5 - 1/5

-1 -1/5

- 2/5

- 2/5

- 1/5 - 1/5

- 2/5

resposta

- 2/5