Question

1) Calcular o valor de X nas proporções:

a) x/7 = 9/21
b) 12/3 = 8/x
c) 28/3x = 7/6
d) x-3/x = 4/5
e) 14/6 = x/9

Me ajudem pfvv

Answer 1

Resposta:

Só multiplicar cruzado que sai.

a) 21x = 7.9

21x = 63

x = 63/21

x = 3

b) 12x = 8.3

12x = 24

x = 2

c) 28.6 = 21x

168 = 21x

x = 168/21

x = 8

d) 5(x-3) = 4x

5x - 15 = 4x

5x - 4x = 15

x = 15

e) 6x = 14.9

6x = 126

x = 21