Question

qual a conta e o resultado dessa conta?
3/7-2/5+12/20​

Answer 1

Olá.

$\frac{3}{7} - \frac{2}{5} + \frac{12}{20} = \frac{60 - 56 + 84 }{140} = \frac{88}{140}$

MMC

7,5,20_______I 2

7,5,10_______I 2

7,5,5_______I 5

7,1,1_______I 7

1,1,1______I 2 . 2 . 5 . 7 = 140

MDC

88,140__________ I 2✓

44,70__________ I 2✓

22,35_________ I 2

11,35_________I 5

11,7_________I 7

11,1________I 11

1,1________I 2 . 2 = 4

88 ÷ 4 = 22

140 ÷ 4 = 35

Resposta 88 / 140 = 22 / 35