Question

Efetue as frações

(-3/7) + (+2/9)


(-1/3) +(+1/5)


(-1/8) +(5/4)


(1/+5) + (+3/5)

Answer 1

Olá...

a)

(- 3/7) + (+ 2/9)

- 3/7 + 2/9 ⇒mmc de 7, 9 = 63

- 27 + 14/63

- 13/63

b)

(- 1/3) + (+ 1/5)

- 1/3 + 1/5 ⇒mmc de 3, 5 = 15

- 5 + 3/15

- 2/15

c)

(- 1/8) + (5/4)

- 1/8 + 5/4⇒mmc de 8, 4 = 8

- 1 + 10/8

9/8

d)

(+ 1/5) + (+ 3/5)⇒mmc =5, 5 = 5

1 + 3/5

4/5

Espero ter ajudado.