Question

calcule as frações abaixo

Answer 1

d) 9/2 + 1/5 + 3/4 + 1/4

= 90/20 + 4/20 + 15/20 + 5/20

= 114/20

= 57/10

e) 6/5 - 5/3 + 1/7  - 7/6 + 2/5

= 252/210 - 350/210 + 30/210 - 245/210 + 84/210

= - 229/210

f) 2/7 - 1/2 + 2/7 - 4/3

= 12/42 - 21/42 + 12/42 - 56/42

= - 53/42

Answer 2

Oi...

d) 9/2 + 1/5 + 3/4 + 1/4 ⇒o mmc de (2,5,4,4) = 20

90 + 4 + 15 + 5/20

114/20 ÷ 2

57/10

e) 6/5 - 5/3 + 1/7 - 7/6 + 2/5

252 - 350 + 30 - 245 + 84/210

366 - 595/210

- 229/210

f) 2/7 - 1/2 + 2/7 - 4/3 ⇒ o mmc de ( 7,2 7,3) = 42

12 - 21 + 12 - 56/42

+ 24 - 77/42

- 53/42

Espero ter ajudado.