Question

alguém me ajuda nessa questão.​

Answer 1

Resposta:

Explicação passo-a-passo:

a)

= 3/8 + 2/9 - 1/7

= (63.3+56.2+72.1)/504

= (189+112+72)/504

= (189+184)/504

= 373/504

R.: 373/504

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obs :

Mmc 8,9,7

8,9,7: 2

4,9,7: 2

2,9,7: 2

1,9,7: 3

1,3,7: 3

1,1,7: 7

1,1,1

= 8.9.7

= 72.7

= 504

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B)

= 2/5+6

= (1.2+5.6)/5

= (2+30)/5

= 32/5

R.: 32/5

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C)

= 26/7 . 5/8

= 26/8 (:2)/(:2). 5/7

= 13/4 . 5/7

= 65/28

R.: 65/28

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D)

= 2/5 + 3/2 .(1/4:3/7)

= 2/5 + 3/2.(1/4 . 7/3)

= 2/5 + 3/2 . 7/12

= 2/5 + 3/12 (:3)/(:3). 7/2

= 2/5 + 1/4 . 7/2

= 2/5 + 7/8

Mmc(5,8)= 40

= (8.2+5.7)/40

= (16+35)/40

= 51/40

R .: 51/40

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E)

= (4/3-1/5) :3

Mmc(3,5)= 15

= (5.4 - 3.1)/15 . 1/3

= (20-3)/15 . 1/3

= 17/15 . 1/3

= 17/45

R.: 17/45

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