Question

1. Calcule as adições e subtrações com frações e simplifique o resultado se for necessário

a) 217 + 3/7 = b) 3/8 + 5/8 = c) 4/5 + 1/8 = d) 7/12 + 5/18 = e) 7/5 - 4/5

= ) 817 - 5/7 = g) 3/2 - 2/3 = h) 2/3 - 1/4 = alguém me ajuda porfavo ​

Answer 1

a)

= 2/7 + 3/7

= (2 + 3)/7

= 5/7

b)

= 3/8 + 5/8

= (3 + 5)/8

= 8/8

= 1

c)

= 4/5 + 1/8

= (4 . 8)/(5 . 8) + (1 . 5)/(8 . 5)

= 32/40 + 5/40

= (32 + 5)/40

= 37/40

d)

= 7/12 + 5/18

= (7 . 3)/(12 . 3) + (5 . 2)/(18 . 2)

= 21/36 + 10/36

= (21 + 10)/36

= 31/36

e)

= 7/5 - 4/5

= (7 - 4)/5

= 3/5

f)

= 8/7 - 5/7

= (8 - 5)/7

= 3/7

g)

= 3/2 - 2/3

= (3 . 3)/(2 . 3) - (2 . 2)/(3 . 2)

= 9/6 - 4/6

= (9 - 4)/6

= 5/6

h)

= 2/3 - 1/4

= (2 . 4)/(3 . 4) - (1 . 3)/(4 . 3)

= 8/12 - 3/12

= (8 - 3)/12

= 5/12

Att. NLE Top Shotta