Question

calcule as seguintes frações A) 2/4+5/3/4. B) 1/5+3/7. c) 3/7-1/4 d) 5/9-2/5​

Answer 1

Resposta:

Explicação passo-a-passo:

A) 2/4+5/3/4

= 2/4 (:2)/(:2) + 5 ÷ 3/4

= 1/2 + 5 . 4/3

= 1/2 + 20/3

Mmc (2,3)= 6

2,3: 2

1,3: 3

1,1

=2.3

= 6

= (3.1 + 2.20)/6

= (3+40)/6

= 43/6

R.: 43/6

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B) 1/5+3/7

= (7.1 + 5.3)/35

= (7+15)/35

= 22/35

R.: 22/35

Mmc (5,7) = 35

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c) 3/7-1/4

= (4.3 - 7.1)/28

= (12-7)/28

= 5/28

R.: 5/28

----------------

Mmc (4,7)= 28

4,7: 2

2,7: 2

1,7: 7

1,1

= 2.2.7

= 4.7

= 28

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d) 5/9-2/5​

= (5.5 - 9.2)/45

= (25 - 18)/45

= 7/45

R.: 7/45

----------------

Mmc (9,5)= 45

9,5: 3

3,5: 3

1,5: 5

1,1

= 3.3.5

= 9.5

= 45