Question

copie e complete a)=3/4=9/... =..../20=30/...=..../80

Answer 1

3/4 = 9/x

3x = 4 · 9
3x = 36
x = 36 ÷ 3
x = 12

⇒ 3/4 = 9/12 = a/20 = 30/b = c/80

9/12 = a/20

12a = 9 · 20
12a = 180
a = 180 ÷ 12
a = 15

⇒ 3/4 = 9/12 = 15/20 = 30/b = c/80

15/20 = 30/b

15b = 20 · 30
15b = 600
b = 600 ÷15
b = 40

⇒ 3/4 = 9/12 = 15/20 = 30/40 = c/80

30/40 = c/80

40c = 30 · 80
40c = 2400
c = 2400 ÷ 40
c = 60

⇒ 3/4 = 9/12 = 15/20 = 30/40 = 60/80



Resposta: 3/4 = 9/12 = 15/20 = 30/40 = 60/80


Espero ter ajudado.
Bons estudos!  : )

Answer 2

Vou representar cada um dos espaços com letras:
3/4 = 9/x = y/20 = 30/z = n/80


3/4 = 9/x
3 . x = 9 . 4
3x = 36
x = 36/3
x = 12

3/4 = 9/12 = y/20

9/12 = y/20
12 . y = 9 . 20
12y = 180
y = 180/12
y = 15

3/4 = 9/12 = 15/20 = 30/z

15/20 = 30/z
15 . z = 20 . 30
15z = 600
z = 600/15
z = 40

3/4 = 9/12 = 15/20 = 30/40 = n/80

30/40 = n/80
40 . n = 30 . 80
40n = 2400
n = 2400/40
n = 60


3/4 = 9/12 = 15/20 = 30/40 = 60/80