Question

Qual resultado na forma irredutível?

a) 2/5 + 1/10 =

b) 5/7 + 1/6 - 1/21 =

Answer 1

a) 2/5 + 1/10 =

Ache o MMC dos denominadores.

5,10 | 2

5,5 | 5

1,1 => 2.5 = 10

4 + 1/10 = 5/10 (divide por 5) = 1/2

b) 5/7 + 1/6 - 1/21 =

MMC (7,6,21)

7, 6, 21 | 2

7, 3, 21 | 3

7, 1, 7 | 7

1, 1, 1 => 42

30+7-2/42 = 35/42 (divide por 7) = 5/6

Answer 2

Oie, tudo bom?

a)

= 2/5 + 1/10 MMC(10)

= (2 . 2)/(5 . 2) + 1/10

= 4/10 + 1/10

= (4 + 1)/10

= 5/10 : (2)

= 1/2

b)

= 5/7 + 1/6 - 1/21 MMC(42)

= (5 . 6)/(7 . 6) + (1 . 7)/(6 . 7) - (1 . 2)/(21 . 2)

= 30/42 + 7/42 - 2/42

= (30 + 7 - 2)/42

= 35/42 : (7)

= 5/6

Att. NLE Top Shotta